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      Question

      The speed of the boat in still water is 7 km/hr and the

      speed of the stream is 5 km/hr. A boat goes 72 km downstream with its usual speed but at the time of returning the speed of the boat in still water is doubled. Find the total time taken by boat to cover the whole distance. TYPE 34
      A 6.6 hours Correct Answer Incorrect Answer
      B 12 hours Correct Answer Incorrect Answer
      C 24 hours Correct Answer Incorrect Answer
      D 14 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      According to the question, Required time = 72/(7 + 5) + 72/(14 – 5) => 72/12 + 72/9 => 6 + 8 = 14 hours

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