Respuesta :

10 miles.

(4/2) to find out what 1/5 is, then multiply by 5 for 5/5

Answer:

10 miles

Step-by-step explanation:

3a/5 + 4 = a

a = race long

4 = a - 3a/5

4 = 5a/5 - 3a/5

4 = 2a/5

4*5/2 = a

a = 10