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      Question

      Speed of a boat in still water is 15 kmph and speed of

      stream is 13 kmph. A man rows to a place at a distance of 56 km and come back to starting point. The total time taken by him is:
      A 10 hrs Correct Answer Incorrect Answer
      B 20 hrs Correct Answer Incorrect Answer
      C 40 hrs Correct Answer Incorrect Answer
      D 30 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Rate upstream = 15 – 13 = 2 kmph Rate downstream = 15 + 13 = 28 kmph Time taken to go upstream = 56/2 = 28 hr Time taken to go downstream = 56/28 = 2 hr Total time = 28 + 2 = 30 hrs

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