Respuesta :

Answer:

18 hours.

Step-by-step explanation:

First you make the fractions have common denominatiors.  3/8 is equivlant to 18/48.  If the road is 18/48 miles long and they can finish 1/48 miles each hour, it will take 18 hours in total.

18 hours because of you multiply 3x6 and 8x6 you get 18/48 so you have 18 hours