- How long could I drive before losing the radio signal?

- How would I work this out?

First of all you need to work out the diameter of the circle. You do this by using the radius. If the radius is 100 miles all the way around then the diameter would be 200 miles because the radius is half of the diameter. It is possible that you could drive the entire 200 miles and hear the radio station all the way.

Now you need to establish how long it would take to drive 200 miles at 40 miles per hour. To do this you need to divide 200 by 40 and the answer is 5. This means the answer is 5 hours.

- Using maths in everyday life