Question
A boat covers a distance of 36 kilometers in still water
in 24 minutes. If the current's speed is two-fifths of the boat's speed in still water, how long will it take for the boat to travel 243 kilometers against the current?Solution
Speed of the boat in still water = 36 X (60/24) = 90 km/h Speed of the stream = 90 X (2/5) = 36 km/h Upstream speed of the boat = 90 - 36 = 54 km/h Required time = (243/54) X 60 = 270 minutes
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