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anonymous

  • 5 years ago

It takes a large pipe 45 minutes to fill a pool. A smaller pipe can fill the pool in 110 minutes. Working together, how long does it take (to the nearest minute) for both pipes to fill the pool.

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  1. amistre64
    • 5 years ago
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    how much of the pool is filled in 1 minute by each of them seperately?

  2. amistre64
    • 5 years ago
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    Lp = 1/45 parts per minute Sp = 1/110 parts per minute right?

  3. amistre64
    • 5 years ago
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    Lp + Sp working together fill the what part in one minute? 1/45 + 1/110 = 155/4950 is my easy math way :)

  4. amistre64
    • 5 years ago
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    155 parts out of 4950 are filled in 1 minute by both pipes working together

  5. amistre64
    • 5 years ago
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    31/990 might be an easier fraction to play with...

  6. anonymous
    • 5 years ago
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    so if the question was in hours would i just find how much of "x" is completed in one hour?

  7. amistre64
    • 5 years ago
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    Yep.... that would be it...then figure out how long it takes to do the entire "job"

  8. amistre64
    • 5 years ago
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    31 minutes and 29/31 left to fill ------ 31| 990 93 ---- 60 31 ---- 29

  9. amistre64
    • 5 years ago
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    id say 32 minutes at most :)

  10. anonymous
    • 5 years ago
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    you lost me

  11. anonymous
    • 5 years ago
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    i got how we had 155/4950

  12. anonymous
    • 5 years ago
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    then we simplified?

  13. amistre64
    • 5 years ago
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    if I did the addition right: we get 155 parts out of 4950 that are being doen in one minute 155 divides 4950 how many time?

  14. anonymous
    • 5 years ago
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    31?

  15. amistre64
    • 5 years ago
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    155 + 155 + 155 + 155....till you get near 4950

  16. anonymous
    • 5 years ago
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    OHHH

  17. anonymous
    • 5 years ago
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    ok i get it THANKS

  18. amistre64
    • 5 years ago
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    155 31 ----- 155 365 ----- 4805 right?

  19. anonymous
    • 5 years ago
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    oh 32

  20. amistre64
    • 5 years ago
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    4950 -4805 ------ 145 more parts to fill out of 155 per minute :)

  21. amistre64
    • 5 years ago
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    which is close to 1 minute so round to 32 :)

  22. anonymous
    • 5 years ago
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    instead of confusing yourself just think about it as if you were filling up your pool asnd you really wanted to go swim do you decide to use both of them so it can go faster one of you freinds asks you about what time will it be done and and you give her an amout of min. whatr would you tell him/her?

  23. amistre64
    • 5 years ago
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    that last part always used to get me... until I realized the the "155" took one full minute and we only needed "145" of those: 145 --- is the reminder of the minute which is close enough to 1 right :) 155

  24. anonymous
    • 5 years ago
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    ok that makes sense

  25. anonymous
    • 5 years ago
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    thanks :)

  26. anonymous
    • 5 years ago
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    who u talkin 2...

  27. anonymous
    • 5 years ago
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    not you

  28. anonymous
    • 5 years ago
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    i no but i want to know which person is right i am trying to figure it our myself and btw dnt be ruse witrh me u dnt know who u tlkkin to...

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