Second 5586

The first pump fills the pool in 12 hours. The second pump fills it in 15 hours. If all three pumps work, the pool will fill in 4 hours. How long will it take to fill the pool with only the third pump?

Correct answer:

t =  10 h

Step-by-step explanation:

1/12+1/15 + 1/t = 1/4 4t/12 + 4t/15 + 4 = t t=10=10 h



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