<PRE><B>Question 1109484</B>
let x be the time it takes the newer pump to drain the pool
:
(1/12) + (1/x) = 1/4
:
1 + 12/x = 3
:
12/x = 2/1
:
2x = 12
:
x = 6
:
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it takes the newer pump 6 hours to drain the pool on its own
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