anonymous
  • anonymous
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
Mathematics
chestercat
  • chestercat
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amistre64
  • amistre64
how much is "left in" after 1 minute?
amistre64
  • amistre64
helps if I read the question thru...
amistre64
  • amistre64
a + b = 9 minutes a = 10 minutes a:10 as a+b:9 9a = 10a + 10b -a = 10b a = -10b ?? does that make sense?

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amistre64
  • amistre64
d... 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 = 10-9 /90 b = 1/90 per minute

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