Question
A boat covers 315 km upstream in 7 hours and 525 km
downstream in 7 hours. Find the time taken by the boat to cover 420 km in still water.Solution
Upstream speed = 315 / 7 = 45 km/hDownstream speed = 525 / 7 = 75 km/hSpeed in still water = (45 + 75) / 2 = 60 km/hRequired time = 420 / 60 = 7 hours
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