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      Question

      A boat travels 30 km upstream and 40 km downstream. The

      speed of the stream is 5 km/h, and the boat’s speed in still water is 15 km/h. How much time does the boat take to cover the entire distance of 70 km?
      A 5 hours Correct Answer Incorrect Answer
      B 8 hours Correct Answer Incorrect Answer
      C 9 hours Correct Answer Incorrect Answer
      D 10 hours Correct Answer Incorrect Answer

      Solution

      Speed upstream = 15 - 5 = 10 km/h. Speed downstream = 15 + 5 = 20 km/h. Time upstream = 30 / 10 = 3 hours. Time downstream = 40 / 20 = 2 hours. Total time = 3 + 2 = 5 hours. Correct Option: a

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