Question
When travelling downstream, a boat takes 4.25 hours to
travel 187 km. If the speed of the stream is (5/11)th of downstream speed of the boat, then find the time taken by the boat to cover 240 km in still water.Solution
Downstream speed of the boat = 187/4.25 = 44 km/hr Speed of the stream = 44 x (5/11) = 20 km/hr So, speed of the boat in still water = 44 – 20 = 24 km/hr Required time taken = 240/24 = 10 hours
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