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Math Help - Help with litres per minute calculations

  1. #1
    Junior Member Turple's Avatar
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    Help with litres per minute calculations

    Hiya, I am doing a homework about a subject we haven't really covered in class! It's very annoying.

    I was just wondering if anyone would be able to help me with it. It's not so much the problem itslef, just the actual method. I just need to know if there is a litres/minute etc triangle? Like there is a distance, speed, time triangle, if that makes sense XD

    If it's litres/minute I assumed that volume would go on the top spot and time udnerneath? If so, what would be in the last bottom one? Or am I completely wrong? :P

    Hope you can help and hope it isn't too much trouble

    Thanks,
    Laura (Turple).
    Last edited by Turple; November 20th 2007 at 08:07 AM.
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Turple View Post
    Hiya, I am doing a homework about a subject we haven't really covered in class! It's very annoying.

    I was just wondering if anyone would be able to help me with it. It's not so much the problem itslef, just the actual method. I just need to know if there is a litres/minute etc triangle? Like there is a distance, speed, time triangle, if that makes sense XD

    Link to DST triangle:dst.jpg - Image - Photobucket - Video and Image Hosting

    If it's litres/minute I assumed that volume would go on the top spot and time udnerneath? If so, what would be in the last bottom one? Or am I completely wrong? :P

    Hope you can help and hope it isn't too much trouble

    Thanks,
    Laura (Turple).
    The little boys and girls in primary school use triangles

    Try figuring things out without the aid of these triangles.

    Give us the problem if you're starting to struggling with it?
    Last edited by janvdl; November 20th 2007 at 11:14 PM. Reason: Typo
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  3. #3
    Junior Member Turple's Avatar
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    :o

    Triangles are handy!!

    Anyway, the problems:

    1. A petrol pump fills a car with 32 litres of petrol in 2 minutes 8 seconds. Give this as a rate in

    a) litres per second b) litres per minute c) litres per hour

    2. Calculate the average flow of the water falling into the bath when 100 litres flow into the bath in 8 minutes.

    Thanks
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  4. #4
    MHF Contributor
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    Quote Originally Posted by Turple View Post
    Triangles are handy!!

    Anyway, the problems:

    1. A petrol pump fills a car with 32 litres of petrol in 2 minutes 8 seconds. Give this as a rate in

    a) litres per second b) litres per minute c) litres per hour

    2. Calculate the average flow of the water falling into the bath when 100 litres flow into the bath in 8 minutes.

    Thanks
    Ratio, Fraction, Dimensional Analysis


    \frac{32\;l}{2\;min\;8\;sec}\;=\;\frac{32\;l}{128\  ;sec}


    \frac{32\;l}{128\;sec}*\frac{60\;sec}{1\;min}


    \frac{32\;l}{128\;sec}*\frac{60\;sec}{1\;min}*\fra  c{60\;min}{1\;hr}


    Do NOT let these scare you. Just WRITE THEM DOWN and let the notation help you. The notation is a much greater friend than the little triangle trick.


    \frac{100\;l}{8\;min} What's to calculate? Just write it down.
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  5. #5
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Turple View Post
    Triangles are handy!!

    Anyway, the problems:

    1. A petrol pump fills a car with 32 litres of petrol in 2 minutes 8 seconds. Give this as a rate in

    a) litres per second b) litres per minute c) litres per hour

    2. Calculate the average flow of the water falling into the bath when 100 litres flow into the bath in 8 minutes.

    Thanks
    1.a) 2 mins 8 secs = 120 secs + 8 secs = 128 secs

    Litres per second means litres OVER time(secs)

    \frac{32}{128} = 0,25 \ litres \ per \ sec

    1.b) Just multiply the answer in 1.a) by 60

    1.c) Multiply the answer in 1.b) by 60

    2.) Average flow, (let's take it as flow per minute): \frac{100}{8} = 12,5 \ litres \ per \ min
    Last edited by janvdl; November 20th 2007 at 11:15 PM. Reason: Typo
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  6. #6
    Junior Member Turple's Avatar
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    Thanks

    Thankyou for you help
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