Math CentralQuandaries & Queries


Question from Tamara, a student:

If a car goes 60 miles in an hour how many kilometres will it go in a second?


The units can direct your calculation. I am going to work with time first. The car goes 60 miles per hour so how far does it go in 1 second?

There are 60 minutes in an hour so

miles per minute

There are 60 seconds in a minute so use this fact to convert 1 mile/minute to miles/second.

Finally use the conversion factor for converting miles to kilometres to convert miles/second to kilometres/second.

When you are finished you can check your answer by typing 60 miles per hour in kilometres per second into Google.


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