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Two pipes fill a tank in 15 and 12 hours. With a leak, both together take 10 hours. How long would the leak take to empty the full tank?

Class 8Leaks and Changing PipesDirect and Inverse Proportions

A20 hours
B60 hours
C30 hours
D40 hours

Step-by-Step Solution

Together without leak:

\frac{4 + 5}{60} = \frac{9}{60}

. With leak:

\frac{6}{60}

. Leak

= \frac{3}{60} = \frac{1}{20}

: 20 hours.

Answer: A) 20 hours

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