Multiple choice

A pipe can fill a cistern in 8 hours. Due to a leak at its bottom, it is filled in 9 hours. When the cistern is full, in how much time will it be emptied by the leakage?

  1. 72 hours

  2. 17 hours

  3. 31.5 hours

  4. 64 hours

  5. 36 hours
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Part of the capacity of the cistern emptied by leakage in 1 hour = (1/8 - 1/9) = (9 - 8)/(8 * 9) = 1/72

Therefore, the leakage will take 72 hours to empty the cistern. This is answer correct.

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