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      Question

      Speed of a motorboat in still water is 50 km per hour if

      the motorboat travels 80 km along the stream in 1 hour 20 minutes, then the time taken by it to cover the same distance against the stream will be.
      A 2h Correct Answer Incorrect Answer
      B 4h Correct Answer Incorrect Answer
      C 6h Correct Answer Incorrect Answer
      D 5h Correct Answer Incorrect Answer

      Solution

      Let the speed of boat in still water =B and speed of stream =S B=50km/h Downstream speed =B+S Upstream speed=B-S=50-10=40km/h Time =Distance/Upstream speed =80/40=2hours.

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