A truck's 40-in.-diameter wheels are turning at 525 rpm.
Find the linear speed of the truck in mph:
40 in x pi x 525 /min x 1 foot/12 inches x 1 mile /5280 foot x 60 min/hr = 62.47 m/hr
40 in x pi x 525 /min x 1 foot/12 inches x 1 mile /5280 foot x 60 min/hr = 62.47 m/hr