Multiple choice

Water flows into a tank which is 200 m long and 150 m wide, through a pipe of cross-section (0.3m \times 0.2m) at 20 km/h. In what time will the water level be 8m?

  1. 200 hr

  2. 250 hr

  3. 350 hr

  4. 450 hr

  5. 500 hr
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A Correct answer
Explanation

The tank volume needed is 200 × 150 × 8 = 240,000 m³. The pipe cross-section is 0.3 × 0.2 = 0.06 m² and water flows at 20 km/h = 20,000 m/h, giving a flow rate of 0.06 × 20,000 = 1,200 m³/h. Time = volume/flow rate = 240,000/1,200 = 200 hours.

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