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Help me with this simple maths calculation, I don't know how to do it! watch

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    Its been quite a while since I was at school so can't work this out. Anyway if I can sprint 50metres in 7.1 seconds, assuming I maintain the same speed, how many seconds will I be able to run 60m in?

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    It all centres around the following formula: v = d/t, where v is the velocity, d is the distance and t is the time.

    You know two of these values to start with, so you can work out the velocity:

    v = 50/7.1 = 7.0422...

    So v = 7.0422...

    Now, rearrange the equation at the top in terms of time, t = d/v. Now substitute in the known value of distance and the value just worked out for the velocity:

    t = 60/7.0422... = 8.52

    Thus you can run 60 metres in 8.52 seconds.
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    (Original post by inthedark1)
    Its been quite a while since I was at school so can't work this out. Anyway if I can sprint 50metres in 7.1 seconds, assuming I maintain the same speed, how many seconds will I be able to run 60m in?

    Thanks
    Ok, so you know the distance and the time for the original distance. From this you can work out the speed (since speed=distance divided by time)
    Once you have the speed, you can then work out the new time with the new distance with time=distance/speed
    Let me know if you're still stuck
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    So, you know Speed = Distance / Time?

    Open spoiler for full answer:

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    So if Speed = Distance / Time

    Speed = 50/7.1 = 7.04 m/s

    So, we now know the speed. So we'll re-arrange "Speed = Distance / Time", to become Time = Distance / Speed:

    Time = 60/7.04 = 8.52 seconds.


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    (Original post by Lemur14)
    Ok, so you know the distance and the time for the original distance. From this you can work out the speed (since speed=distance divided by time)
    Once you have the speed, you can then work out the new time with the new distance with time=distance/speed
    Let me know if you're still stuck
    Ok thanks, some people have kindly told me the answer. I swear I used to be able to do these calculation!

    Thanks guys.. now add in 5 hurdles to the calculation as Ive been put in a 60m hurdle race as well No one else will do it and apparantly you get a point even if you come last. Of course last will be an achievement for me Im just hoping to clear them. Well at least Ive got a time for the 60m flat even if its a bad one
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    (Original post by inthedark1)
    Ok thanks, some people have kindly told me the answer. I swear I used to be able to do these calculation!

    Thanks guys.. now add in 5 hurdles to the calculation as Ive been put in a 60m hurdle race as well No one else will do it and apparantly you get a point even if you come last. Of course last will be an achievement for me Im just hoping to clear them. Well at least Ive got a time for the 60m flat even if its a bad one
    I'm sure you'll do great! I could never hit anything like those times...Hurdles will slow everyone down, just concentrate on getting over them rather than the speed
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    You don’t need to know any formulas for this question:

    All you need to know is that:
    7.1 seconds = 50 metres
    Divide both sides by 5 to see how quickly you can run 10 metres, then multiply both sides by 6 since you want 60 metres. This is the most basic way to do without any formulas. You are left with 8.52
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