Question
When travelling downstream, a boat takes 5.25 hours to
travel 147 km. If the speed of the stream is (3/7)th of downstream speed of the boat, then find the time taken by the boat to cover 224 km in still water.Solution
Downstream speed of the boat = 147/5.25 = 28 km/hr Speed of the stream = 28 x (3/7) = 12 km/hr So, speed of the boat in still water = 28 – 12 = 16 km/hr Required time taken = 224/16 = 14 hours
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