Question
The speed of a boat in still water increases by 4
km/hour after each hour. The speed of stream is 3 km/hour. If the boat travelled 60 km in 3 hours in downstream, then find time taken by the boat to cover 96 km distance with the initial speed of boat in downstreamSolution
Let the initial speed of boat in still water be = x km/hr (x + 3) + (x + 7) + (x + 11) = 60 3x + 21 = 60 3x = 39 x = 13 km/hr Required time will be = 96/16 = 6 km/hr
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