This is aptitude questions and answers section on Boats and Streams with explanation for various interview, competitive examinations and entrance tests.

1. A person can swim in still water at 4 km/h. If the speed of water 2 km/h, how
many hours will the man take to swim back against the current for 6km?
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2. A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The
speed of the stream is?
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Answer: Option D

Explanation:

100 --- 10 DS = 10

? ---- 1

75 ---- 15 US = 5

? ----- 1 S = (10 - 5)/2

= 2 2 ½ kmph

3. A man can row his boat with the stream at 6 km/h and against the stream in 4
km/h. The man's rate is?
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4. A man can swim in still water at 4.5 km/h, but takes twice as long to swim
upstream than downstream. The speed of the stream is?
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Answer: Option D

Explanation:

M = 4.5

S = x

DS = 4.5 + x

US = 4.5 + x

4.5 + x = (4.5 - x)2

4.5 + x = 9 -2x

3x = 4.5

x = 1.5

5. A man can row with a speed of 15 kmph in still water. If the stream flows at 5
kmph, then the speed in downstream is?
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