I mean, if you’re converting feet to miles, you’re doing something weird.
Why on Earth would I ever do that?
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If I was a rail engineer, I would have a chart (or a calculator if its past the year 1980)
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Can you divide 1000 by 39 quickly and easily?
It’s called an example. Want another one? How many laps do you need to run on a 400 m track to run a 10k? How many people can you serve with your 2.5 kg steak if everybody needs to get a 250 g steak? Need more?