You've got your time...

By now you should have a time for yourself 'sprinting' 20m or 100m. You may even have times for walking, jogging and striding those distances.

How do you change (convert) your time for 20m (or 100m) to kms/hr (kilometres per hour)?
Easily...

Let's say for 20m you ran 3.45 seconds.
We need to find out how far you ran in each (or one) second. Do this by long division, or by using a calculator.

20/3.45 = 5.8
20metres divided by 3.45 seconds = 5.8 metres per second; or 5.8 metres per each one second

There are 60 seconds in a minute so multiply 5.8m by 60 and you will know how many metres per minute you can run:
5.8 x 60 = 348 metres per second

There 60 minutes in an hour so multiply 348 by 60 and you will know how many metres per hour you can run:
348 x 60 = 20,880 metres per hour

This is a big number. You know that there are 1,000 metres per kilometre so divide 20,880 by 1,000 and you will know how many kilometres per hour you can run (your "speed")

20,880 / 1,000 = 20.88 kilometres per hour

This person can run 20.88 km/hr

Would this be fast enough to escape the T-Rex?
But... how long could you run this speed for?

Compare your result to your friends or classmates.
You may like to calculate the average for the class, or draw a graph showing everyone's results.