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A boat running downstream covers a distance of 40km in 4hrs and covering the same distance upstream in 8hrs. What is the speed of a boat in still water.
6km/hr
7km/hr
7.5km/hr
8.5km/hr
Downstream speed=40/4=10km/hr Upstream speed=40/8=5km/hr So speed of boat in still water=(10+5)/2=15/2 =7.5km/hr
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