SOLUTION: one pump can drain a pool in 7 minutes. When a second pump is also used together with the first, the pool only takes 3 minutes to drain. How long would it take the second pump to d

Question 746009: one pump can drain a pool in 7 minutes. When a second pump is also used together with the first, the pool only takes 3 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of draining to get their
rate of draining together
( 1 pool / 7 min ) + ( 1 pool / t min ) = ( 1 pool / 3 )
Solve for

Multiply both sides by

It will take the 2nd pump
5 min and 15 sec by itself

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