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Speed Distance Time for Dummies

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    it doesn't seem to come out exactly which is unusual.

    A = 1 1/14 hrs
    B = 1 2/14 hrs

    A + B = 2 3/14 hrs = 2 6/28
    T = 1 3/4 hrs = 1 21/28

    A + B + T = 1 27/28 hrs = 1 hrs 58 minutes (rounded)

    I think

    Although you are from the calculator generations fractions can be faster if you need to do it in your head sometimes
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    Would someone be kind enough to explain to me how the miles per minute method works when working out time? I have been using the fraction method but feel this might be a quicker way to working time questions out.
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    (Original post by Old_Simon)
    Lol. You have to do this for real, upside down, pulling 6g, and doing 500 knots in an aircraft that cost the tax payer tens of millions of pounds. Ok the Q above ( these need to be done in your head in seconds if you ever want to sit in a military aircraft)

    In the first hour we do 210 miles. We subtract that from 392 so we have 182 miles to run. What is 182/210? We notice immediately that both 182 and 210 are divisible by 14 conveniently giving us 13/15. 1/15 of one hour takes 4 minutes. We burn fuel at 135 kgs an hour and we notice immediately by inspection 135 is divisible by 15 giving us 9.
    13 x 9 = 117 kgs. So in total we burn 210 + 117 kgs of fuel.
    Simples.
    Should this not be 135 + 117kgs?

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