- A9.6 h
- B15 h
- C12 h
- D14.4 h
Step-by-Step Solution
Pipes together: . Kept: → 15 h. (14.4 h adds 20% to 12 h, which is not the same.)
Answer: B) 15 h
Pipes A and B fill a tank in 20 and 30 hours, but a leak lets only 80% of the incoming water stay in the tank. With both pipes open, how long does the empty tank take to fill?
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