# The scale of a map 1 : 4, 000, 000. The distance between Leeds and London on this map is 8 : 125 cm. How do you calculate the actual distance between Leeds and London?

$325 k m$
The scale tells you that $1 c m$ on your map corresponds to $4 , 000 , 000 c m$ in real world.
If you measure on the map $8.125$ in real world you have:
$8.125 \times 4 , 000 , 000 = 32 , 500 , 000 c m = 325 , 000 m = 325 k m$