Multiple choice

Pipes A and B can fill a tank in 72 min and 96 min respectively.Pipe C can empty it at the rate of the 1.5 lit/min.The three pipes filled it in 288 min.Find the capacity of the tank in litres.

  1. 72

  2. 108

  3. 96

  4. 60
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let capacity be V. Rates are V/72, V/96, and -1.5. (V/72 + V/96 - 1.5) * 288 = V. (4V + 3V - 432) / 288 * 288 = V. 7V - 432 = V. 6V = 432. V = 72.

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