Question

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

Answer 1

rate downstream=(15/3 ¾)km/hr=(15*4/15)km/hr=4km/hr.


Rate upstream=(5/2 ½)km/hr=(5*2/5)km/hr=2km/hr.


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