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      Question

      If a boat travels 15 km more in downstream than in

      upstream  in 3 hours and if the speed of the Boat in still water is 17 kmph.  Find the distance travelled by boat in downstream in 6 hours?
      A 92 km Correct Answer Incorrect Answer
      B 117 km Correct Answer Incorrect Answer
      C 88 km Correct Answer Incorrect Answer
      D 148 km Correct Answer Incorrect Answer

      Solution

      Difference in travelling distance in downstream and upstream in 1 hour is 5 km    Let the speed of upstream be x km/hr   Speed of downstream = x + 5 km/hr   speed of the Boat in still water  = 17 km/hr   1/2 x (x + x + 5) = 17   2x + 5 = 34   x = 14.5 km/hr   Speed of downstream = 14.5 + 5 = 19.5 km/hr   Distance travelled in 6 hours = 19.5 x 6 = 117 km

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