Posted by ReRe Please Help!! on Sunday, March 21, 2010 at 6:57pm.
One pump can drain the pool in 11 minutes. When a second pump is used, it only takes 9 minutes. How long would it take the second pump to drain the pool if it were the only pump in use?

Algebra  Damon, Sunday, March 21, 2010 at 7:11pm
Pump 1 drains 1/11 pools per minute
Pump 2 drains 1/x pools per minute
(1/11 +1/x)pools/min * 9min = 1 pool
(1/11 + 1/x) =1/9
1/x = 1/9 1/11 = 11/99 9/99 = 2/99
so the second pump does 2/99 pool;s per minute or
99/2 minutes per pool

Algebra  ReRe Please Help!!, Sunday, March 21, 2010 at 7:38pm
Damon, Im not for sure what the 2/99 stands for.

Algebra  PsyDAG, Monday, March 22, 2010 at 11:22am
If the pool has 99 units, then the pump will drain 2 of these units per minute.
Answer This Question
Related Questions
 Algebra  One pump can drain the pool in 11 minutes. When a second pump is used...
 Math  It takes an older pump 4 times as long to drain a certain pool as it does...
 college algebra  Pump A alone can empty the city pool in 12 hours. If only pump...
 algebra  Pump A can fill a swimming pool in 6 hours and pump B can fill the ...
 Chemistry  To drain a round swimming pool that is 18.0 ft wide and 3.75 ft deep...
 Algebra I  Pump A, working alone, can fill a tank in 3 hours, and pump B can ...
 mathalgebra  one pump can empty a pool in 5 days, wheras a second pump can ...
 math  If pump A and pump B work together, they can fill a pool in 4 hours. Pump...
 Math  Each of three pumps A, B, C can pump water either into, or out of, a ...
 math  One pump can empty a pool in 5 days, whereas a second pump can empty the ...
More Related Questions