Multiple choice

Pipe A can fill a tank completely in 6 hours. However, on account of a leak in the tank, it takes 2 hours more to fill the tank. How long will the leak take to empty the full tank when pipe A is closed?

  1. 18 hours

  2. 20 hours

  3. 22 hours

  4. 24 hours
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pipe A fills at 1/6 tank per hour. With the leak, net fill rate is 1/8 per hour. Leak rate = 1/6 - 1/8 = 1/24 per hour, meaning the leak alone would empty a full tank in 24 hours.

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