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      Question

      A boat takes 3 hours 45 minutes to cover 67.5 km in

      downstream. The ratio of the speed of the boat in still water to the speed of the stream is 5:1. Find the speed of the boat while going upstream.
      A 12 km/h Correct Answer Incorrect Answer
      B 18 km/h Correct Answer Incorrect Answer
      C 24 km/h Correct Answer Incorrect Answer
      D 32 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Speed of boat in downstream = 67.5 ├╖ 3.75 = 18 km/h
      Let speed of boat in still water and speed of stream be 5x km/h and x km/h
      Ratio of downstream to upstream = (5x + x)/(5x тАУ x) = 6x/4x = 3:2
      Therefore, speed upstream = (18 ├Ч 2)/3 = 12 km/h

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