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      Question

      The speed of a boat in still water is 15 km/hr, and the speed of the stream is 20% of the speed of the boat in still water. Find the total time taken by the boat to cover 108 km downstream and 72 km upstream.

      A 12 hours Correct Answer Incorrect Answer
      B 10 hours Correct Answer Incorrect Answer
      C 14 hours Correct Answer Incorrect Answer
      D 16 hours Correct Answer Incorrect Answer

      Solution

      So, speed of stream = 15 X (20/100) = 3 km/hr

      So, the downstream speed of the boat = 15 + 3 = 18 km/hr

      Or, the upstream speed of the boat = 15 - 3 = 12 km/hr

      So, required time = (108/18) + (72/12) = 6 + 6 = 12 hours 

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