Question
A boat covers 48 km downstream in 4 hours and 32 km
upstream in 4 hours. If the speed of the stream increases by 2 km/h, then what will be the new upstream speed of the boat?Solution
ATQ, Downstream speed = 48/4 = 12 km/h Upstream speed = 32/4 = 8 km/h Speed of boat in still water = (12 + 8)/2 = 10 km/h Speed of stream = (12 - 8)/2 = 2 km/h If stream speed increases by 2 km/h, new stream speed = 4 km/h New upstream speed = 10 - 4 = 6 km/h Hence, the correct answer is 6 km/h.
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