On Rural Highways, the Average Speed S (In Miles Per

Multiple Choice

On rural highways, the average speed S (in miles per hour) is related to the amount of curvature C (in degrees) of the road. Suppose that on a straight road (C = 0) , the average speed is 47.5 miles per hour and that this decreases by 0.65 mph for each additional degree of curvature. What is the average speed if the curvature is 15 degrees?

A) 42.35 mph
B) 37.75 mph
C) 57.15 mph
D) 38.35 mph