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      Question

      The speed of a boat in still water is 28 km/hr. If the

      boat covers 140 km in upstream in 7 hours, then find the time taken by the boat to travel 144 km in downstream.
      A 3 hours Correct Answer Incorrect Answer
      B 2.5 hours Correct Answer Incorrect Answer
      C 4 hours Correct Answer Incorrect Answer
      D 3.5 hours Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water and the speed of the current be тАШxтАЩ km/hr and тАШyтАЩ km/hr, respectively Upstream speed of the boat = (x тАУ y) = 140/7 = 20 km/hr Or, 28 тАУ y = 20 Or, y = 28 тАУ 20 = 8 km/hr Therefore, downstream speed of the boat = 28 + 8 = 36 km/hr Required time taken = 144/36 = 4 hours

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