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In a stream running at 2 km/hr, a motorboat goes 10 km upstream and back again to the starting point in 55 minutes. Find the speed (km/hr) of the motorboat in still water.
Distance = time * [B^2 – R^2] / 2*B
10 =55/60 * [B^2 – 2^2] / 2*B
B = 22 km/hr
By: Manpreet kaur ProfileResourcesReport error
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