Question
When travelling downstream, a boat takes 7 hours to
travel 280 km. If the speed of the stream is (2/5)th of downstream speed of the boat, then find the time taken by the boat to cover 360 km in still water.Solution
Downstream speed of the boat = 280/7 = 40 km/hr Speed of the stream = 40 x (2/5) = 16 km/hr So, speed of the boat in still water = 40 – 16 = 24 km/hr Required time taken = 360/24 = 15 hours
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