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miles per hour in america. kilometers per hour in most other places.

In the UK the only legal units of distance and speed for land transport are still the Statute Mile and yards, and miles per hour, respectively.

(For roads anyway. I'm not sure what the British railway system uses nowadays. I think it's still miles and mph, but historically they have always used miles, chains and yards for distances.)

Otherwise, metres / second in the Metric and its SI offshoot. Or feet per second.

It rather depends on what you're measuring: m/s or mm/s would make sense for something like the moving parts of a machine, say, but absurd for geological processes where mm/year would be appropriate. And in astronomy, km/s would save three 0s in the statistics, although you'd probably use index notation anyway.

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12y ago

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