Two cars leave Newark at the same time traveling in opposite

Two cars leave Newark at the same time traveling in opposite directions. After 3 hours, the two cars are 330 miles apart. If one car average 60mph, what is the distance traveled by each car?

D=RT
330=(60+X)3
330=180+3X
3X=330-180
3X=150
X=50PH IS THE SPEED OF THE SECOND CAR.
PROOF:
330=(60+50)3
330=110*3
330=330