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in Mathematics by (63.7k points)

A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2hours 30minutes to cover a distance of 5km upstream. find the speed of the river current in km/hr.

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Best answer

Rate downstream=(15/3 3/4)km/hr = (15*4/15)km/hr = 4km/hr. 

Rate upstream=(5/2 1/2)km/hr = (5*2/5)km/hr = 2km/hr.

Speed of current=1/2(4-2)km/hr=1km/hr

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