Question

A skier reaches the end of a 0.9km track in 1.5m, at what speed does it travel?

Answer 1

Speed = $\frac{distance}{time}$

distance = 0.9 * 1000 = 900 metres, because speed is measured in m/s so the km has to be converted to m

time = 1.5 * 60 = 90 seconds , because speed is measured in m/s so the time in minutes(m) has to be converted to seconds(s)

Speed = $\frac{900}{90}$

           = 10m/s