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      Question

      Water flows into a tank which is 200m long and 120 m

      wide, through a pipe of cross- section 0.3 m × 0.2 m at 20 km/hr. then the time ( in hr) for the water level in the tank to reach 9 m is ?
      A 150 hrs Correct Answer Incorrect Answer
      B 120 hrs Correct Answer Incorrect Answer
      C 180 hrs Correct Answer Incorrect Answer
      D 210 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Volume of tank = 200m x 120 m x 9m ; Volume filled in 1 hr by pipe = 0.3 m x 0.2 m x 20 km/hr = 0.3 x 0.2 x 20000m/hr = 1200m3 /hr ; So time required to fill the tank = (200 x 120 x 9m 3 )/1200m 3 = 180 hrs

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