Solve the problem The radius of the tires of a car is 18 inc

Solve the problem. The radius of the tires of a car is 18 inches, and they are revolving at the rate of 651 revolutions per minute. How fast is the car traveling in miles per hour? (A) 1953/880 pi mph (B) 1953/88 pi mph (C) 5859/22 pi mph (D) 1953/176 pi mph

Solution

Each revolution moves the car 2*pi*18 inches, and so it goes (2*pi*651 *18) (inches per minute).

Thus it goes( 2*pi*60*651*18) inches per hour.

Thus it goes (2*pi*60*651*18)/ 63360 miles per hour.

= [(1953pi)/(88)] miles per hour.

Answere B.