Q.

A swimmer wishes to cross a 500-m river flowing at 5 kmh-1. His speed with respect to water is 3 kmh-1. The shortest possible time to cross the river is

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a

10 min

b

20 min

c

6 min

d

7.5 min

answer is A.

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Detailed Solution

Shortest time =dv=1/23=16 h=10 min
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A swimmer wishes to cross a 500-m river flowing at 5 kmh-1. His speed with respect to water is 3 kmh-1. The shortest possible time to cross the river is