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Pump 1 can empty a pool in 9 hours while Pump 2 can empty the same pool in 12 hours. If the two pumps worked together, how long would it take them to empty the pool?

Mathematics
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Solve the following inequality: 2x + 6 ≤ 5x - 9
Pump 1 does 1/9 per hour and Pump 2 does 1/12 per hour
how many hours then together?

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Other answers:

Work out how much the two are doing per hour together and u can easily get your answer...
about 5 hours about 5 hours and 10 minutes about 5 hours and 20 minutes about 5 hours and 30 minutes ?
\[\frac{ 1pool }{ 9 hours }*T hours + \frac{ 1pool }{ 12 hours}*Thours = 1 pool\] t/9 + t/12 =1
solve for t
5 hours?
you solved for t and got t=5?
idk
how do i get the t?
multiply the whole equation by (9*12)
108
yes, multiply the whole equation by 108
it will be easier for you if you leave 108 as 9*12 , but do it however you like...
so the answerr is 5hr and 30mns
what did you get for t?
A plane traveling from Dallas to New York with a tailwind of 30 miles per hour takes 4.5 hours. Returning with the headwind, it takes the same plane 5 hours. What is the average speed of the plane in calm conditions? A plane traveling from Dallas to New York with a tailwind of 30 miles per hour takes 4.5 hours. Returning with the headwind, it takes the same plane 5 hours. What is the average speed of the plane in calm conditions?
go right to the answer, no agony \[\frac{9\times 12}{9+12}\]
so its 9
i seriously doubt \[\frac{9\times 12}{9+12}=9\]
i got 5.1428567143
so the answer is 5hrs?

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