Bitesize has changed! We're updating subjects as fast as we can. Visit our new site to find Bitesize guides and clips - and tell us what you think!

Home > Maths > Measures > Measures




Speed, distance and time

Speed is worked out by dividing the distance travelled by the time taken:

Speed = Distance divided by Time

If you travel at 70 km in 2 hours. What is your average speed?


Speed = distance ÷ time

Speed = 70 ÷ 2 = 35 km/h

The distance in km and the time in h, so the units for speed are km/h.

If you know the speed, you can work out the time or the distance by re-arranging the equation.

speed = distance ÷ time

distance = speed × time

time = distance ÷ speed


If you walk for 1 1/2 hours at an average speed of 4 miles/h. How far will you have walked?


Speed = distance ÷ time

Distance = Speed × Time

Distance = 4 × 1.5 = 6 miles



Measures activity

Is your knowledge off the scale?


Gut Instinct

Can you match Viral Vinnie's appetite for English, Maths and Science?

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.