alleryA pump fills a tank in 5 hours, but with a leak it takes 6 hours. The leak alone would empty it in
A30 hours
B11 hours
C25 hours
D20 hours
Answer & Solution
Correct answer: A. 30 hours
Leak rate is 1/5 - 1/6 = 1/30 per hour, so 30 hours to empty.
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