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- anonymous

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?

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- anonymous

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- anonymous

Solve the following inequality: 2x + 6 ≤ 5x - 9

- anonymous

Pump 1 does 1/9 per hour and Pump 2 does 1/12 per hour

- anonymous

how many hours then together?

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- anonymous

Work out how much the two are doing per hour together and u can easily get your answer...

- anonymous

about 5 hours
about 5 hours and 10 minutes
about 5 hours and 20 minutes
about 5 hours and 30 minutes ?

- anonymous

\[\frac{ 1pool }{ 9 hours }*T hours + \frac{ 1pool }{ 12 hours}*Thours = 1 pool\]
t/9 + t/12 =1

- anonymous

solve for t

- anonymous

5 hours?

- anonymous

you solved for t and got t=5?

- anonymous

idk

- anonymous

how do i get the t?

- anonymous

multiply the whole equation by (9*12)

- anonymous

108

- anonymous

yes, multiply the whole equation by 108

- anonymous

it will be easier for you if you leave 108 as 9*12 , but do it however you like...

- anonymous

so the answerr is 5hr and 30mns

- anonymous

what did you get for t?

- anonymous

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?

- anonymous

go right to the answer, no agony
\[\frac{9\times 12}{9+12}\]

- anonymous

so its 9

- anonymous

i seriously doubt
\[\frac{9\times 12}{9+12}=9\]

- anonymous

i got 5.1428567143

- anonymous

so the answer is 5hrs?

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