Question
When travelling downstream, a boat takes 4.25 hours to
travel 204 km. If the speed of the stream is (3/8)th of downstream speed of the boat, then find the time taken by the boat to cover 270 km in still water.Solution
Downstream speed of the boat = 204/4.25 = 48 km/hr Speed of the stream = 48 x (3/8) = 18 km/hr So, speed of the boat in still water = 48 – 18 = 30 km/hr Required time taken = 270/30 = 9 hours
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