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      Question

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

      30:7. The boat goes along with the current in 4 hours 12 minutes. It will come back in
      A 9(4/5) hrs Correct Answer Incorrect Answer
      B 7(1/9) hrs Correct Answer Incorrect Answer
      C 6(3/4) hrs Correct Answer Incorrect Answer
      D 4(1/3) hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water = 30 km/hr And the speed of the current = 7 km/hr Time = 4 hours 12 minutes = 21/5 hrs Downstream speed = 30 + 7 = 37 km/hr Upstream speed = 30 – 7 = 23 km/hr Distance = Downstream speed × Downstream time Distance = [37 × (21/5)] km Upstream time = Distance / Upstream speed Upstream time = [37 × (21/5)]/23 = `6(3/4)` hrs

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