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anonymous
 5 years ago
one pump can drain a pool in 10 min . when second pump is also used, the pool only takes 9 min to drain. How long would it take the second pump to drain if it were the only pump in use.
a. 90minutes b. 89minutes c. 4 14/9 minutes d. 1/90 minutes
anonymous
 5 years ago
one pump can drain a pool in 10 min . when second pump is also used, the pool only takes 9 min to drain. How long would it take the second pump to drain if it were the only pump in use. a. 90minutes b. 89minutes c. 4 14/9 minutes d. 1/90 minutes

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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0how much is "left in" after 1 minute?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0helps if I read the question thru...

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0a + b = 9 minutes a = 10 minutes a:10 as a+b:9 9a = 10a + 10b a = 10b a = 10b ?? does that make sense?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0d... a = 1/10 drained in one minute a+b = 1/9 drained in a minute 1/10 + b = 1/9 per minute b = 1/9  1/10 b = 109 /90 b = 1/90 per minute
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