A distance-time graph, sometimes referred to as a travel graph, is a way of representing a journey. It is helpful to have prior knowledge of speed, distance and time as well as how to work out the ...

If you want to know exactly how far, and fast, you've run, then a speed-and-distance monitoring (SDM) watch is an essential piece of kit. Timex, Garmin and Navman produce SDMs that use satellites ...