Question
A boatman covers 192 km upstream in 4 hours and 288 km
downstream in 4 hours. Find the time taken by the boatman to cover 240 km in still water.Solution
Upstream speed = 192 / 4 = 48 km/h Downstream speed = 288 / 4 = 72 km/h Speed in still water = (48 + 72) / 2 = 60 km/h Required time = 240 / 60 = 4 hours
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