Question

5miles = 8km. How many km in 250 miles?

Answer 1

you can make a proportion
5       250
--- = ------
8        x

then cross multiply and divide.  8 times 250 =2000/5=400

250 miles are 400 km

Answer 2

5 miles ... 8 km
250 miles ... x km = ?

If you would like to know how many km equals to 250 miles, you can calculate this using the following steps:

5 * x = 8 * 250    /5
x = 8 * 250 / 5
x = 400 km

The correct result would be 400 km.