Answer: 9.41 miles per hour.
Explanation:
Since, Here The average speed of one race car driver,
miles per hour
And, The average speed of another driver,
miles per hour
Thus, first driver is faster than second driver ( because his speed is greater than that of second)
And, He is faster than second by the speed =
= 151.89-142.48= 9.41 miles per hour.