Originally Posted by

**Earl6282** It's embarrassing to say but I'm basically having to re-learn algebra after not touching the subject for about 5 years.

I'm going through ACT practice tests and this problem came up. The guide book helps you put the word problem into equation form but just assumes you know what to do from there to solve for X. And this one has been driving me crazy.

"Amy drove 200 miles at an average speed of 10 mph *faster *than her usual average speed. If she completed the trip in 1 hour *less *than usual, what is her usual driving speed?"

(r) is her usual speed.