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?

Question

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

how many hours then together?

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

solve for t

anonymous · Answer

5 hours?

anonymous · Answer

you solved for t and got t=5?

anonymous · Answer

idk

anonymous · Answer

how do i get the t?

anonymous · Answer

multiply the whole equation by (9*12)

anonymous · Answer

108

anonymous · Answer

yes, multiply the whole equation by 108

anonymous · Answer

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

anonymous · Answer

so the answerr is 5hr and 30mns

anonymous · Answer

what did you get for t?

anonymous · Answer

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 · Answer

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

anonymous · Answer

so its 9

anonymous · Answer

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

anonymous · Answer

i got 5.1428567143

anonymous · Answer

so the answer is 5hrs?