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Q.

A boat moves with a speed of 5 km/hr relative to water in a river flowing with a speed of 3 km/hr and having a width of 1 km. The min time taken around a round trip. ( Given for min time the boat has to move perpendicular to the river flow)

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a

60 min

b

30 min

c

5 min

d

20 min

answer is D.

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Detailed Solution

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For the round trip he should cross the river perpendicularly. Time for one trip = (¼) hr = 15 min. So for a round trip he will take 30 min.

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