alleryA pipe fills a tank in 4 hours. Due to a leak, it now takes 6 hours. The leak alone would empty a full tank in:
A$10$ hours
B$8$ hours
C$12$ hours
D$24$ hours
Answer & Solution
Correct answer: C. $12$ hours
Pipe rate = 1/4. Net rate (with leak) = 1/6. Leak rate = 1/4 − 1/6 = 3/12 − 2/12 = 1/12 per hour.
Leak alone empties in 12 hours.
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