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      Question

      To go 1 km upstream, a boat takes 50 seconds. Coming back

      the same 1 km downstream takes 40 seconds. Find the boat's speed in still water.
      A 31.25 m/s Correct Answer Incorrect Answer
      B 22.5 m/s Correct Answer Incorrect Answer
      C 11.29 m/s Correct Answer Incorrect Answer
      D 45.5 m/s Correct Answer Incorrect Answer

      Solution

      ATQ,

      Speed of boat in upstream = (1000 / 50) = 20 m/s

      Speed of boat in downstream = (1000 / 40) = 25 m/s

      Speed of the boat in still water = [(20 + 25) / 2] = 22.5 m/s

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