Need help with this

Question

Jose drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took
7
hours. When Jose drove home, there was no traffic and the trip only took
5
hours. If his average rate was
18
miles per hour faster on the trip home, how far away does Jose live from the mountains?

Answer 1

distance=rate*time

d=r*7 (up)

d=(r+18)*5 (back)

set the 2 right sides equal

7r=5(r+18)

7r=5r+90

7r-5r=90

2r=90

r=45 mph

d=45*7=315 miles, or...

d=(45+18)*5

d=63*5=315 miles