Calculating speed given distance and time

Try these examples:

Question

Alan travels 100km\,in\,5hrs.

Find his average speed in km/h.

Triangle illustrating speed equals distance over time.

Speed = \frac{{Distance}}{{Time}}

Speed = \frac{{100}}{5}

Speed = 20km/h

Alan's average speed is 20km/h.

Question

Find the speed of a train which travels 243km in 2hrs\,15mins.

Triangle illustrating speed equals distance over time.

Speed = \frac{{Distance}}{{Time}}

Time = 2hrs\,15mins

15mins = 0.25hr

Speed = \frac{{243}}{{2.25}}

Speed = 108km/h

The train is travelling at 108km/h.