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Water flows a tank 200 x 150m through a rectangular pipe 1.5 x 1.25m at the rate at 20kmph. In what time will be water rises by 2 meters?

Correct answer: D. 96min

  • A. 76 min
  • B. 80min
  • C. 90min
  • D. 96min

Explanation

The required water volume is 200 m × 150 m × 2 m = 60,000 m3. The pipe area is 1.5 m × 1.25 m = 1.875 m2, and at 20 km/h = 20,000 m/h its flow is 37,500 m3/h, so time = 60,000 m3 ÷ 37,500 m3/h = 1.6 h = 96 min. The likely wrong choice is 90 min, caused by rounding the flow or time too early.

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