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Question

A man can row a boat with 4 km/hr in still water. If he is crossing a river where the current is 2 km/hr, how long will it take him to row 2 km upstream and then back to his starting point?

A
34 hr
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B
32 hr
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C
23 hr
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D
43 hr
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Solution

The correct option is D 43 hr
Time taken to row 2 km upstream, T1=DistanceVbVr=242=1 hr
Time taken to row 2 km downstream T2=DistanceVb+Vr=24+2=13 hr
Total time T=T1+T2=(1+13) hr=43 hr

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