This set of Aptitude Questions and Answers (MCQs) focuses on “Boats and Streams – Set 3”.

1. The speed of a boat is 2.788 m / s upstream. If the speed of the boat in still water is 17 kmph, find the speed of the boat downstream.

a) 22 kmph

b) 23 kmph

c) 24 kmph

d) 28 kmph

View Answer

Explanation: The speed of the boat in still water = 17 kmph

The speed of the boat upstream = 2.778 m / s = 10 kmph

The speed of the stream = 17 – 10 = 7 kmph

The speed of the boat downstream = 17 + 7 = 24 kmph

2. The speed of the stream up stream is 4.167 m / s and the speed of the stream is 5 kmph. Find the speed of the boat downstream.

a) 15 kmph

b) 20 kmph

c) 25 kmph

d) 27 kmph

View Answer

Explanation: The speed of the stream = 5 kmph

The speed of the boat upstream = 4.167 m / s = 15 kmph

The speed of the boat downstream 15 + 5 + 5 = 25 kmph

3. The speed of the boat in still water is 27 kmph. The speed of the stream is 1.389 m / s. Find the speed of the boat upstream.

a) 22 kmph

b) 24 kmph

c) 26 kmph

d) 28 kmph

View Answer

Explanation: The speed of the boat in still water = 27 kmph

The speed of the stream = 1.389 m / s = 5 kmph

The speed of the boat upstream 27 – 5 = 22 kmph

4. The speed of the boat upstream is 17 kmph. The speed of the boat downstream is 10.56 m / s. Find the speed of the stream.

a) 7.5 kmph

b) 8.5 kmph

c) 9.4 kmph

d) 10.5 kmph

View Answer

Explanation: The speed of the boat upstream = 17 kmph

The speed of the boat downstream = 10.56 m / s = 38 kmph

The speed of the stream = (38 – 17) / 2 = 21 / 2 = 10.5 kmph

5. The speed of the stream is 21 kmph. The speed of the boat downstream is 13 m / s. Find the speed of the boat in still water.

a) 3.14 m / s

b) 4.77 m / s

c) 6.91 m / s

d) 7.17 m / s

View Answer

Explanation: The speed of the stream = 21 kmph = 5.83 m / s

The speed of the boat downstream = 13 m / s

The speed of the boat in still water = 13 – 5.83 = 7.17 m / s

6. The speed of the boat upstream is 60 kmph. The speed of the boat downstream is 17.5 m / s. Find the speed of the stream.

a) 0.5 kmph

b) 1.5 kmph

c) 1.7 kmph

d) 2.0 kmph

View Answer

Explanation: The speed of the boat upstream = 60 kmph

The speed of the boat downstream = 17.5 m / s = 63 kmph

The speed of the stream = (63 – 60) / 2 = 3 / 2 = 1.5 kmph

7. The speed of the boat upstream is 47 kmph. The speed of the boat downstream is 17 m / s. Find the speed of the stream.

a) 6.4 kmph

b) 7.1 kmph

c) 8.2 kmph

d) 8.5 kmph

View Answer

Explanation: The speed of the boat upstream = 47 kmph

The speed of the boat downstream = 17 m / s = 61.2 kmph

The speed of the stream = (61.2 – 47) / 2 = 14.2 / 2 = 7.1 kmph

8. The speed of a boat upstream is 3 m / s. The speed of the stream is 14.4 kmph. Find the speed of the boat downstream in m / s.

a) 9.99 m / s

b) 11 m / s

c) 13.7 m / s

d) 15 m / s

View Answer

Explanation: The speed of the boat upstream = 3 m / s

The speed of the stream = 14.4 kmph = 4 m / s

The speed of the boat = 3 + 4 = 7 m / s

The speed of the boat downstream = 7 + 4 = 11 m / s

9. The speed of a boat upstream is 9 m / s. The speed of the stream is 9 kmph. Find the speed of the boat downstream.

a) 50.4 kmph

b) 40.9 kmph

c) 35.8 kmph

d) 36.66 kmph

View Answer

Explanation: The speed of the boat upstream = 9 m / s

The speed of the stream = 9 kmph = 2.5 m / s

The speed of the boat in still water = 9 + 2.5 = 11.5 m / s

The speed of the boat downstream = 11.5 + 2.5 = 14 m / s = 50.4 kmph

10. The speed of the boat downstream is 23 kmph. The speed of the boat upstream is 5.278 m / s. Find the speed of the stream.

a) 2 m / s

b) 1 m / s

c) 2 kmph

d) 1 kmph

View Answer

Explanation: The speed of the boat downstream = 23 kmph

The speed of the boat upstream = 5.278 m / s = 19 kmph

The speed of the stream = (23 – 19) / 2 = 4 / 2 = 2 kmph

11. The speed of the boat downstream is 3 m / s. The speed of the stream is 5 kmph. Find the speed of the boat upstream.

a) 0.8 kmph

b) 0.8 m / s

c) 20.8 kmph

d) 20.8 m / s

View Answer

Explanation: The speed of the boat downstream = 3 m / s = 10.8 kmph

The speed of the stream = 5 kmph

The speed of the boat upstream = 10.8 – 5 – 5 = 10.8 – 10 = 0.8 kmph

12. The speed of the boat upstream is 30 kmph. The speed of the boat downstream is 10 m / s. Find the speed of the stream.

a) 2 kmph

b) 1.7 kmph

c) 1 kmph

d) 3 kmph

View Answer

Explanation: The speed of the boat upstream = 30 kmph

The speed of the boat downstream = 10 m / s = 36 kmph

The speed of the stream = (36 – 30) / 2 = 6 / 2 = 3 kmph

13. The speed of the stream is 12 kmph. The speed of the boat downstream is 13.33 m / s. Find the speed of the boat in still water.

a) 7 m / s

b) 8 m / s

c) 9 m / s

d) 10 m / s

View Answer

Explanation: The speed of the stream = 12 kmph = 3.33 m / s

The speed of the boat downstream = 13.33 m / s

The speed of the boat in still water = 13.33 – 3.33 = 10 m / s

14. The speed of the boat upstream is 50 kmph. The speed of the boat downstream is 20 m / s. Find the speed of the stream.

a) 11 kmph

b) 17 kmph

c) 18.8 kmph

d) 19.9 kmph

View Answer

Explanation: The speed of the boat upstream = 50 kmph

The speed of the boat downstream = 20 m / s = 72 kmph

The speed of the stream = (72 – 50) / 2 = 22 / 2 = 11 kmph

15. The speed of the boat upstream is 37 kmph. The speed of the boat downstream is 12.5 m / s. Find the speed of the stream.

a) 2 kmph

b) 3.8 kmph

c) 4 kmph

d) 5.6 kmph

View Answer

Explanation: The speed of the boat upstream = 37 kmph

The speed of the boat downstream = 12.5 m / s = 45 kmph

The speed of the stream = (45 – 37) / 2 = 8 / 2 = 4 kmph

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