A boat goes 25 km in upstream in 5 hours and takes 4 hours to complete a distance of 36 km in downstream. Find the speed of boat in still water.
Speed of boat in still water = (D + U)/2 Upstream speed (U) = 25/5 = 5 km/hr Downstream speed (D) = 36/4 = 9 km/hr Speed of boat in still water = (5 + 9)/2 = 14/2 = 7 km/hr
The downstream speed of a boat is 6 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream ...
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...
