A man can row a boat with 4km/hr in still water. If he is crossing a river where the current is 2km/hr, how long will it take him to row 2km upstream and then back to his starting point?
A
34hr
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B
32hr
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C
23hr
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D
43hr
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Solution
The correct option is D43hr Time taken to row 2km upstream, T1=DistanceVb−Vr=24−2=1hr
Time taken to row 2km downstream T2=DistanceVb+Vr=24+2=13hr ∴Total time T=T1+T2=(1+13)hr=43hr