Question
A boat running downstream covers a distance of 45 km in
9 hrs and covering the same distance upstream in 15 hrs. What is the speed of a boat in still water?Solution
Downstream speed = 45/9 = 5 km/hr Upstream speed = 45/15 = 3 km/hr So speed of boat in still water = (5 + 3)/2 = 4 km/hr
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