while traveling downstream a boat cover 154km in 7hours if the speed of the stream is 4km/hr find the time taken by boat to cover a same distance upstream
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Upstream speed = Distance/time = 63/9 = 7 km/hr
Downstream speed = Distance/time = 63/7 = 9 km/hr
∵ Speed in still water = 1/2 × (Upstream speed + Downstream speed)
∴ Speed of boat in still water = (9 + 7)/2 = 8 km/hr
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