Discussion

A man can row three-quarters of a kilometer against the stream in 11 ¼ minutes and return in 7 ½ minutes. The speed of the man in still water is?

Answer: D

Distance covered upstream in 45/4min =3/4 km

Distance covered upstream in 1 hr =(3/4 × 2/15 × 60) km/hr = 4 km/hr

Distance covered downstream in 15/2 min = ¾ km

Distance covered downstream in 1hr

= (3/4 × 2/15 × 60)km/hr = 6 km/hr

Speed of the man in still water

= ½ (6 + 4)km/hr = 5 km/hr

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