Question

The longest river in the UK is the river Severn which has a length of 24 cm on a map. If the map is drawn at a scale of 1:1,500,000, then how many kilometers is the river actually?

Answer 1

The length of river is 360km

Explanation:

Length on the map of Severn river = 24cm

Scale on the map = x:y axis

=1:1500000

Where y is the length

Hence 1 cm= 15 km

Therefore

Length of the river

=24
`*`15

=360 km

Hence the length of river is 360 km

Answer 2

360 km

Explanation:

The length on the ground will be ...

(24·10^-2 m)·(1.5·10^6) = 36·10^4 m = 360·10^3 m = 360 km