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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