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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 ?

What distance in above question


Time in u.s = 9hrs
speed of boat in still water = X
speed of current = 3km/hr
speed in u.s = (X-3)km/hr
s = D/T

now , (X+3)=D/T
L=9(X-3) / (X+3)

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