Jenny drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took
10
hours. When Jenny drove home, there was no traffic and the trip only took
7
hours. If her average rate was
18
miles per hour faster on the trip home, how far away does Jenny live from the mountains?

Question

Jenny drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 
10
 hours. When Jenny drove home, there was no traffic and the trip only took 
7
 hours. If her average rate was 
18
 miles per hour faster on the trip home, how far away does Jenny live from the mountains?

anonymous · Answer

@Cardinal_Carlo

anonymous · Answer

We only need the speed going back home. So:
$$f(7) = 18(7) = 126$$
Jenny lives 126 miles from the mountains.

anonymous · Answer

thanks

anonymous · Answer

420miles was the anwser

anonymous · Answer

I read over the *faster than* clause. My bad

anonymous · Answer

Two cars leave towns 
570
 kilometers apart at the same time and travel toward each other. One car's rate is 
12
 kilometers per hour more than the other's. If they meet in 
3
 hours, what is the rate of the faster car?