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      Question

      The speed of a boat in still water is 6 km/hr more than

      that of the current. The time taken by the boat to cover 875 km downstream is 17.5 hours. Find the total time taken by boat to travel 650 km downstream and 45 km upstream.
      A 21.5 hours Correct Answer Incorrect Answer
      B 10.5 hours Correct Answer Incorrect Answer
      C 20.5 hours Correct Answer Incorrect Answer
      D 15.5 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Therefore, downstream speed of the boat = 875/17.5 = 50 km/hr And, upstream speed of the boat = 6 km/hr Required time taken = (650/50) + (45/6) = 13 + 7.5 = 20.5 hours

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