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A man can row 8 km/hr in still water. If it takes him thrice as long to row up, as to row down the river, then the rate of current in the stream would be
6.5km/hr
4.5km/hr
4km/hr
5.5km/hr
Ratio 3:1 u=8km/hr (8-v)*3t = (8+v)*t 24-3v=8+v 4v=16 v=4km/hr.
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