Two cars started from the same point and traveled on a straight course in opposite directions for exactly \(3\) hours

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Two cars started from the same point and traveled on a straight course in opposite directions for exactly \(3\) hours, at which time they were \(300\) miles apart. If one car traveled, on average, \(10\) miles per hour faster than the other car, what was the average speed of the slower car for the \(3\)-hour trip?

A. \(40\) miles per hour
B. \(45\) miles per hour
C. \(50\) miles per hour
D. \(55\) miles per hour
E. \(60\) miles per hour

The OA is B
Source: — Problem Solving |