## anonymous 3 years ago 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?

1. anonymous

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

2. anonymous

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

3. anonymous

how many hours then together?

4. anonymous

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

5. anonymous

6. anonymous

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

7. anonymous

solve for t

8. anonymous

5 hours?

9. anonymous

you solved for t and got t=5?

10. anonymous

idk

11. anonymous

how do i get the t?

12. anonymous

multiply the whole equation by (9*12)

13. anonymous

108

14. anonymous

yes, multiply the whole equation by 108

15. anonymous

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

16. anonymous

so the answerr is 5hr and 30mns

17. anonymous

what did you get for t?

18. 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?

19. anonymous

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

20. anonymous

so its 9

21. anonymous

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

22. anonymous

i got 5.1428567143

23. anonymous