Answer:
78 km
Step-by-step explanation:
the statement tell us:
2cm= 5km.
so we need to find 31.2cm in the given scale (km)
we multiply 31.2cm by 5km
and divide the result by 2cm
as follows
31.2cm*5km=156cm*km
156cm*km/2cm=78km
finally the answer is 78 km