A motor boat travels 32 km upstream and then returns downstream to the origin point. The speed of boat in still water be 6 km/hr and and the speed of the current is and the speed of the current is 2 km/hr. Find the total time for the whole journey.
Let the total journey time be t hr.
Then, we have d = t(x2 - y2)/2x
=> 32 = t(36 - 4)/(2 x 6)
=> t = 12 hr
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