SOLUTION: two cars start from the same point and travel in opposite directions. One car goes 15 mph faster than the other. In the 3 hours the cares are 315 miles apart. What is the rate of

Question 446063: two cars start from the same point and travel in opposite directions. One car goes 15 mph faster than the other. In the 3 hours the cares are 315 miles apart. What is the rate of the faster car?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Car I x mph
Car II x+ 15
..
They are going away from each other.

So add up their speed.

combined speed = x+x+15
(2x+15)
Time = 3 hours
Distance = 315 miles
Distance = speed * time
(2x+15)*3=315
6x+45=315
6x=315+-45
6x=270
/6
x=45 mph Car I
Car II 45+15=60 mph

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