Convert the hour to 60 minutes then divide them both by 20 to get your answer.
b.If we divide 4.5 km by 0.5 km we get 9, so the distance on the map must be 9 cm. working out what 1 cm on the map is equivalent to as a real life distance. A map has a scale of 1:25000. This means that 1 cm on the map is 25000 cm in real life, which is 250 m or 0.25 km.
