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You need to time its movement over a known distance.

For example, movement over 100 metres, in 10 seconds gives a speed of

100 (metres) [divided by] 10 (seconds) .

= 100/10

Divide that out = 10 metres per second.

For example a car travels 10 miles in 10 minutes.

Speed is therefore 10/10 = 1 mile per minute.

You have to make the minutes into a measurement of hours to make sense of it to a layman.

To get from 10 minutes up to an hour, you need to multiply by 6.

10 mins x 6 = 60 minutes in an hour, see.

So in an hour, you have to multiply the distance the car travels by 6 as well.

10 miles x 6 . = 60 miles.

So speed is 60 miles / 1 hour = 60 miles an hour.

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13y ago

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