This set of Aptitude Questions and Answers (MCQs) focuses on “Boats and Streams – Set 2”.
1. A man rows at a speed of 12 kmph in still water. If the river is running at a speed of 5 kmph, it takes him 55 minutes to row to a place. What is the minimum possible distance between his initial position and final position?
a) 5.41 km
b) 6.41 km
c) 15.58 km
d) 11 km
View Answer
Explanation: The minimum possible distance between the two positions is possible if the man is rowing upstream. By assuming this we are minimising the actual speed and hence minimising the distance covered.
The actual speed of the man = his speed in still water (–) the speed of the stream = 12 – 5 = 7 kmph
The time taken = 55 minutes
The distance = speed * time = 55 * 7 / 60 = 6.41 km
2. A man rows at a speed of 12 kmph in still water. If the river is running at a speed of 5 kmph, it takes him 55 minutes to row to a place. What is the maximum possible distance between his initial position and final position?
a) 5.41 km
b) 6.41 km
c) 15.58 km
d) 11 km
View Answer
Explanation: The maximum possible distance between the two positions is possible if the man rows downstream. By assuming this we are maximising the actual speed and hence maximising the distance covered.
The actual speed of the man = his speed in still water + the speed of the stream = 12 + 5 = 17 kmph
The time taken = 55 minutes
The distance = speed * time = 17 * 55 / 60 = 15.58 km
3. A boat travels 40 km upstream in 5 hours and 88 km downstream in 8 hours. Find the speed of the stream.
a) 1 kmph
b) 1.5 kmph
c) 2 kmph
d) 2.5 kmph
View Answer
Explanation: The speed of the boat upstream = 40 / 5 = 8 kmph
The speed of the boat downstream = 88 / 8 = 11 kmph
The difference between the speeds = 11 – 8 = 3 kmph
The speed of the stream = 3 / 2 = 1.5 kmph
4. The speed of a boat upstream is 8 kmph and the speed of the boat downstream is 12 kmph. Find the speed of the boat.
a) 8 kmph
b) 10 kmph
c) 12 kmph
d) 20 kmph
View Answer
Explanation: The speed of the boat = (8 + 12) / 2 = 20 / 2 = 10 kmph
5. The speed of a boat is 9 kmph upstream. If the speed of the boat in still water is 12.5 kmph, find the speed of the boat downstream.
a) 12 kmph
b) 15 kmph
c) 16 kmph
d) 19 kmph
View Answer
Explanation: The sped o the boat in still water = 12.5 kmph
The speed of the stream = 12.5 – 9 = 3.5 kmph
The speed of the boat downstream = 12.5 + 3.5 = 16 kmph
6. The speed of the stream up stream is 7 kmph and the speed of the stream is 0.83 m / s. find the speed of the boat downstream.
a) 7 kmph
b) 10 kmph
c) 13 kmph
d) 16 kmph
View Answer
Explanation: The speed of the stream = 0.83 m / s = 3 kmph
The speed of the boat downstream = 3 + 7 + 3 = 13 kmph
7. The speed of the boat in still water is 4 m / s. The speed of the stream is 7 kmph. Find the speed of the boat upstream.
a) 7.4 kmph
b) 7 kmph
c) 11 kmph
d) 14.4 kmph
View Answer
Explanation: The speed of the boat in still water = 4 m / s = 14.4 kmph
The speed of the stream = 7 kmph
The speed of the boat upstream = 14.4 – 7 = 7.4 kmph
8. The speed of the boat upstream is 6 m / s. The speed of the boat downstream is 27 kmph. Find the speed of the stream.
a) 2 kmph
b) 1.7 kmph
c) 1 kmph
d) 2.7 kmph
View Answer
Explanation: The speed of the boat upstream = 6 m / s = 21.6 kmph
The speed of the boat downstream = 27 kmph
The speed of the stream = (27 – 21.6) / 2 = 5.4 / 2 = 2.7 kmph
9. The speed of the stream is 8 m / s. The speed of the boat downstream is 43.2 kmph. Find the speed of the boat in still water.
a) 1 m / s
b) 2 m / s
c) 3 m / s
d) 4 m / s
View Answer
Explanation: The speed of the stream = 8 m / s
The speed of the boat downstream = 43.2 kmph = 12 m / s
The speed of the boat in still water = 12 – 8 = 4 m / s
10. The speed of the boat upstream is 11 m / s. The speed of the boat downstream is 41 kmph. Find the speed of the stream.
a) 0 kmph
b) 1.7 kmph
c) 1 kmph
d) 0.7 kmph
View Answer
Explanation: The speed of the boat upstream = 11 m / s = 39.6 kmph
The speed of the boat downstream = 41 kmph
The speed of the stream = (41 – 39.6) / 2 = 1.4 / 2 = 0.7 kmph
11. The speed of the boat upstream is 9 m / s. The speed of the boat downstream is 40 kmph. Find the speed of the stream.
a) 2.4 kmph
b) 3.8 kmph
c) 4.2 kmph
d) 5.6 kmph
View Answer
Explanation: The speed of the boat upstream = 9 m / s = 32.4 kmph
The speed of the boat downstream = 40 kmph
The speed of the stream = (40 – 32.4) / 2 = 7.6 / 2 = 3.8 kmph
12. The speed of a boat upstream is 8 kmph. The speed of the stream is 9 kmph. Find the speed of the boat downstream in m / s.
a) 3.7 m / s
b) 7.2 m / s
c) 9.8 m / s
d) 9.6 m / s
View Answer
Explanation: The speed of the boat upstream = 8 kmph
The speed of the stream = 9 kmph
The speed of the boat = 8 + 9 = 17 kmph
The speed of the boat downstream = 17 + 9 = 26 kmph = 7.2 m / s
13. The speed of a boat upstream is 8 m / s. The speed of the stream is 8 kmph. Find the speed of the boat downstream.
a) 44.78 kmph
b) 40.67 kmph
c) 36.88 kmph
d) 32.66 kmph
View Answer
Explanation: The speed of the boat upstream = 8 m / s
The speed of the stream = 8 kmph = 2.22 m / s
The speed of the boat in still water = 8 + 2.22 = 10.22 m / s
The speed of the boat downstream = 10.22 + 2.22 = 12.44 m / s = 44.78 kmph
14. The speed of the boat downstream is 4 m / s. The speed of the boat upstream is 10 kmph. Find the speed of the stream.
a) 2.2 m / s
b) 1.1 m / s
c) 2.2 kmph
d) 1.1 kmph
View Answer
Explanation: The speed of the boat downstream = 4 m / s = 14.4 kmph
The speed of the boat upstream = 10 kmph
The speed of the stream = (14.4 – 10) / 2 = 4.4 / 2 = 2.2 kmph
15. The speed of the boat downstream is 13 kmph. The speed of the stream is 1 m / s. Find the speed of the boat upstream.
a) 5.611 kmph
b) 5.611 m / s
c) 22 kmph
d) 22 m / s
View Answer
Explanation: The speed of the boat downstream = 13 kmph
The speed of the stream = 1 m / s = 3.6 kmph
The speed of the boat upstream = 13 + 3.6 + 3.6 = 20.2 kmph = 5.611 m / s
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