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      Question

      Speed of current is equal to 20% of speed of boat in

      still water. If the boat takes 4 hours to cover 120 km in still water, then find the time taken by the boat to cover 96 km in upstream.
      A 5 hours Correct Answer Incorrect Answer
      B 2 hours Correct Answer Incorrect Answer
      C 4 hours Correct Answer Incorrect Answer
      D 3 hours Correct Answer Incorrect Answer

      Solution

      Speed of the boat in still water = 120 รท 4 = 30 km/h Speed of current = 30 ร— 0.20 = 6 km/h Therefore, upstream speed of the boat = 30 โ€“ 6 = 24 km/hr Required time taken = 96 รท 24 = 4 hours

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