A boat goes 52 km in upstream in 4 hours and takes 3 hours to complete a distance of 21 km in downstream. Find the speed of boat in still water.
Speed of boat in still water = (D + U)/2 Upstream speed (U) = 52/4 = 13 km/hr Downstream speed (D) = 21/3 = 7 km/hr Speed of boat in still water = (13 + 7)/2 = 20/2 = 10 km/hr
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