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A boat takes 9 hrs to travel from A to B upstream. If the river current is 3 km/hr, how long will it take to travel downstream between B and A ?



Time taken=9 hrs
speed of the river=3 km/hr
let the speed of the boat be x
speed upstream= x-3
distance=speed x time
             =(x-3) x 9
speed downstream=x+3
0 0 0
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