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A boat running rows downstream covers a distance of 20 km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is ?
7 km/hr
8 km/hr
9 km/hr
10 km/hr
Downstream speed, D = 20 km/2hrs = 10 km/h Upstream speed, U = 20 km/5hr = 4 km/h Speed of boat in still water = D + U/2 = 10 + 4/2 = 7 km/h
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