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      Question

      The speed of a boat is that of the current of water is

      32:5. The boat goes along with the current in 3 hours 10 minutes. It will come back in
      A 9(4/5) hrs Correct Answer Incorrect Answer
      B 7(1/3) hrs Correct Answer Incorrect Answer
      C 6(3/4) hrs Correct Answer Incorrect Answer
      D 4(1/3) hrs Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water = 32 km/hr And the speed of the current = 5 km/hr Time = 3 hours 10 minutes = 19/6 hrs Downstream speed = 32 + 5 = 37 km/hr Upstream speed = 32 – 5 = 27 km/hr Distance = Downstream speed × Downstream time Distance = [37 × (19/6)] km Upstream time = Distance / Upstream speed Upstream time = [37 × (19/6)]/27 = `4(1/3)` hrs

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