Question
Boat speed in still water = 12 km/h, stream speed = 3
km/h. Time to go 30 km downstream and return 30 km upstream?Solution
ATQ, Downstream speed = 15 => time = 30/15 = 2 h Upstream speed = 9 => time = 30/9 = 10/3 h Total = 2 + 10/3 = 16/3 h = 5 h 20 min Answer: 5 h 20 min
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