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Boats and Streams Aptitude Questions and Answers
| Quiz Name | Boats and Streams |
| Category | Aptitude |
| Number of Questions | 25 |
| Time | 30 Minutes |
| Exam Type | MCQ (Multiple Choice Questions) |
Boats and Streams Aptitude Online Test – Practice Here
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1. The sum of the speed of boat and stream in downstream and upstream is 56km/h and the time taken by boat in upstream is 45min whereas in downstream is 30min. find the difference between the distance travelled in upstream and downstream if the speed of stream is 4km/hr.
a) 5km
b) 2km
c) 6km
d) 7km
e) 8km
Answer: 2
Explanation:
2. If the ratio of speed in upstream and downstream be 3:5. Then, find the time taken by boat to cover the total distance of 120m in both upstream and downstream if the speed of stream is 4m/sec.
a) 14 sec
b) 12 sec
c) 15 sec
d) 16 sec
e) 26 sec
Answer: D
Explanation:
3. Speed of motor boat in still water is 18kmph. If the motar boat travels 90km along the stream in 3hours, then the time taken by it to cover the same distance against the stream will be:
a) 18 hours
b) 15 hours
c) 16 hours
d) 17 hours
e) 19 hours
Answer: B
Explanation:
4. A boat takes 12 hours to cover a distance of 180 km in downstream, while in still water it takes 8 hours more. Find the time taken by boat to cover the distance of 72 km in upstream.
a) 20 hours
b) 24 hours
c) 30 hours
d) 18 hours
e) 15 hours
Answer: B
Explanation:
5. A boat can travel with 60 km along the flow of a river in 6 hours. If it takes 10 hours to return the same distance, then what is the speed of the flow of the river?
a) 3.5 km/h
b) 2 km/h
c) 4 km/h
d) 1 km/h
e) 0.5 km/h
Answer: B
Explanation:
6. A boat takes total time of 32 hours to travel 120 km downstream and same distance upstream. The speed of boat in still water is four times that of the current, then what is the time taken by boat to travels 80 km downstream?
a) 12 hours
b) 2 hours
c) 8 hours
d) 5 hours
e) 10 hours
Answer: C
Explanation:
7. Speed of a boat is 16 km per hour more than the speed of the stream. Time taken by boat to cover the distance 36 km downstream is equal to the time taken to cover the distance 24 km upstream, then the speed of the stream is
a) 4 km/hr
b) 3.5 km/hr
c) 3 km/hr
d) 2.5 km/hr
e) 2 km/hr
Answer: A
Explanation:
8. A boatman can go certain distance downstream in 2 hrs. and upstream same distance in 3 hrs. If the stream flow at the speed of 4 km/h, find the speed of boat in still water.
a) 8 km/h
b) 12 km/h
c) 20 km/h
d) 10 km/h
e) None
Answer: C
Explanation:
Let the speed of the boat in still water is B km/h.
Since he is traveling the same distance upstream and downstream;
Then,
(B + 4)×2 = (B − 4)×3
⇒ 2B + 8 = 3B −12
⇒ B = 8 + 12
⇒ B = 20 km/hr
9. There are two signal posts P & Q in a river which flows along PQ. Distance between P and Q is divided in three equal Parts by points X and Y. The time taken by a boat to row from P to Y and Q to Y are in the ratio of 6 : 7. The ratio of the speed of the boat in downstream to the speed of river current is equal to:
a) 7 : 2
b) 7 : 3
c) 5 : 2
d) 3 : 8
e) None
Answer: A
Explanation: 
10. A jet ski goes upstream at a speed of 96 km/hr and comes back the same distance at 160 km/hr. Find the average speed (in km/hr) for the total journey.
a) 100 km/hr
b) 120 km/hr
c) 140 km/hr
d) 150 km/hr
e) None
Answer: B
Explanation:
11. The speed of a boat in still water is 12km/h. It goes 18km downstream and comes back to the starting point in 4 hours. What is the speed of the stream in km/h?
a) 3
b) 3.5
c) 4.5
d) 6
e) None
Answer: D
Explanation:
12. The distance between two places P and W is 18 km. A boat travels from W to P upstream and then returns from P to W downstream and takes a total of 4 hours 30 minutes for the entire journey. If the speed of the current is 3 km/hr, then what is the speed of the boat (in Km/min) in still water?
a) 18
b) 9
c) 0.3
d) 0.15
e) None
Answer: D
Explanation:
13. A boat goes 120 km downstream and 104 km upstream in 11.5 hr. Speed of the boat in still water is 5 times the speed of the stream. In what time the boat will cover a distance of 96 km upstream and return to starting point?
a) 12 hr
b) 8 hr
c) 15 hr
d) 10 hr
e) None
Answer: D
Explanation:
14. A motor boat having a leak which admits 30 tonnes of water in 10 mins, is 200 km away from the shore. 400 tonnes of water is sufficient to sink the boat , but the pump can throw 100 tonnes per hour . The average rate of sailing that the boat just reach the shore as it begins to sink is :
a) 35 Km/hr
b) 40 km/hr
c) 20 Km/hr
d) 30 Km/hr
e) None of these
Answer: B
Explanation:
In 1 hour water enters into the Boat = 30 * 6 =>180 tonnes
In 1 hour pump throw water = 100 tonnes
Water collected in boat in 1 hour = 180 – 100 =>80 tonnes
Time in which 400 tonnes of water enter the ship = 400/80
=>5 hours
Speed = 200/5
=>40 Km/hr
15. In one hour, a boat goes 13 km/hr in the direction of the stream and 7 km/hr against the direction of the stream. What will be the speed of the boat in still water?
a) 8 km/hr
b) 10 km/hr
c) 14 km/hr
d) 6 km/hr
e) Cannot Be Determined
Answer: B
Explanation:
According to the formula,
Speed of a boat in still water = ½ (Downstream Speed + Upstream Speed)
Speed of boat in still water = ½ (13+7) = ½ × 20 = 10 km/hr
16. A woman can row upstream at 16 km/hr and downstream at 26 km/hr. What is the speed of the stream?
a) 5 km/hr
b) 2 km/hr
c) 4.5 km/hr
d) 21 km/hr
e) 12 km/hr
Answer: A
Explanation:
According to the formula,
Speed of the stream = ½ (Downstream Speed – Upstream Speed)
Speed of the stream = ½ (26-16) = ½ × 10 = 5 km/hr
17. Ratio between speed of boat in still water to speed of stream is 5 : 2. If 224 km is travelled by downstream in 4 hours then find the difference between speed of boat in still water and speed of stream?
a) 24 km/hr
b) 22 km/hr
c) 28 km/hr
d) 26 km/hr
e) 30 km/hr
Answer: A
Explanation:
Ratio between speed of boat in still water to speed of stream is 5 : 2
Downstream speed = 7p (⸫ since 5+2)
Downstream speed in kmph =224/4 = 56kmp
56kmph =7p => p =8
Difference between speed of boat and speed of stream = 5p-2p = 3p
= 3×8=24kmph
18. A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man’s speed against the current is:
a) 8.5 km/hr
b) 9 km/hr
c) 10 km/hr
d) 12.5 km/hr
e) None of these
Answer: C
Explanation:
Man’s rate in still water = (15 – 2.5) km/hr = 12.5 km/hr.
Man’s rate against the current = (12.5 – 2.5) km/hr = 10 km/hr
19. A boat takes 28 hours for travelling downstream from point A to point B and coming back to point C midway between A and B. If the velocity of the stream is 6km/hr and the speed of the boat in still water is 9 km/hr, what is the distance between A and B?
a) 115 kms
b) 120 kms
c) 140 kms
d) 165 kms
e) None of these
Answer: B
Explanation:
Downstream speed = 9+6 = 15
Upstream speed = 9-6 = 3
Now total time is 28 hours
If distance between A and B is d, then distance BC = d/2
Now distance/speed = time, so d/15 + (d/2)/3= 28
Solved = 120 kms
20. A boat can travel 20 km downstream in 24 min. The ratio of the speed of the boat in still water to the speed of the stream is 4 : 1. How much time will the boat take to cover 15 km upstream?
a) 20 mins
b) 22 mins
c) 25 mins
d) 30 mins
e) None of these
Answer: D
Explanation:
Down speed =20/24*60=50km/hr
4:1 =4x:x
Downstream speed = 4x+x=5x
Upstream speed = 4x-x=3x
5x= 50; x=10
so up speed 3*10=30
Time = 15/30*60= 30 mins
21. A boat whose speed in 20 km/hr in still water goes 40 km downstream and comes back in a total of 5 hours. The approx. speed of the stream (in km/hr) is:
a) 6 km/hr
b) 9 km/hr
c) 12 km/hr
d) 16 km/hr
e) None of these
Answer: B
Explanation:
Let the speed of the stream be x km/hr. Then,
Speed downstream = (20 + x) km/hr, Speed upstream = (20 – x) km/hr.
40/20+x + 40/20-x = 5
X= 9 km/hr appx.
22. A person can swim in water with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, what will be the time taken by the person to go 68 km downstream?
a) 2.5 hours
b) 3 hours
c) 4 hours
d) 3.5 hours
e) 4.5 hours
Answer: C
Explanation:
Downstream Speed = (13+4) km/hr = 17 km/hr
To travel 68 km downstream.
Time taken = 68/17 = 4 hours
23. In one hour, a boat goes 13 km/hr in the direction of the stream and 7 km/hr against the direction of the stream. What will be the speed of the boat in still water?
a) 8 km/hr
b) 10 km/hr
c) 14 km/hr
d) 6 km/hr
e) Cannot Be Determined
Answer: B
Explanation:
According to the formula,
Speed of a boat in still water = ½ (Downstream Speed + Upstream Speed)
Speed of boat in still water = ½ (13+7) = ½ × 20 = 10 km/hr
24. A woman can row upstream at 16 km/hr and downstream at 26 km/hr. What is the speed of the stream?
a) 5 km/hr
b) 2 km/hr
c) 4.5 km/hr
d) 21 km/hr
e) 12 km/hr
Answer: A
Explanation:
According to the formula,
Speed of the stream = ½ (Downstream Speed – Upstream Speed)
Speed of the stream = ½ (26-16) = ½ × 10 = 5 km/hr
25. A boat is moving 2 km against the current of the stream in 1 hour and moves 1 km in the direction of the current in 10 minutes. How long will it take the boat to go 5 km in stationary water?
a) 1 hr 20 minutes
b) 1 hr 30 minutes
c) 1 hr 15 minutes
d) 30 minutes
e) 45 minutes
Answer: C
Explanation:
Downstream = (1/10 × 60) = 6 km/hr
Upstream = 2 km/hr
Speed in still water = ½ (6+2) = 4 km/hr
So, the time is taken by the boat to go 5km in stationary water = 5/4 hrs = 1 ¼ hrs = 1 hr 15 minutes
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Boats and Streams – Problem Solving Tricks
Knowing Shortcuts and Tricks will help you a lot in solving these kinds of Questions. Now, in this section, we are going to work on providing the Boats and Streams Problem Solving Tricks. Therefore, check them. And get an idea. Then eventually, try on some problems. Then you can go ahead and take the Test. Well, the Quiz we are providing on this page is for free. Yes, you heard it right. So, what are waiting for? Go ahead and take the Test.
Boats and Streams Formulas & Tricks
Now, in this section, we are going to provide information about the common terminology that will be used in the Question. Along with that, we are also providing some basic Formulas. Well, by memorizing and practicing, you will have an outline on how to solve the problems. Therefore, please check them. And then try to take the Quiz we gave on this page. Surely, you can top it.
- In the Problem, Water in the direction along with the stream is known as the Downstream.
- And Water Against the Stream is known as the Upstream.
If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr
- Speed downstream = (u + v) km/hr.
- Speed upstream = (u – v) km/hr.
If the speed downstream is a km/hr and the speed upstream is b km/hr
- Speed is still water = 1/2 (a + b) km/hr.
- Rate of stream = 1/2 (a – b) km/hr.
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