Question
A boatman rows 216 km upstream in 6 hours and 432 km
downstream in 6 hours. How long will it take to row 324 km in still water?Solution
Upstream speed = 216 / 6 = 36 km/h Downstream speed = 432 / 6 = 72 km/h Speed in still water = (36 + 72) / 2 = 54 km/h Required time = 324 / 54 = 6 hours
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