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# Speed Distance Time for Dummies

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1. 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
2. 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.
3. (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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