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**desperate_on_sunday_night** If a rocket car with 20 inch radius tires brakes the sound barrier (a speed in excess of 760 miles/hour), what is the angular speed of the wheels in revolutions/second?

ok i am totally lost.....all i know is one revolution would probably be 40pi inches because that the circumfrence of the circle...and i thought i probably have to use the formula v=rw (v=linear speed, r=radius and w=angular speed)

so i started with

760mi/hr = 20w but im confused with the units??? i dont know if i even started it off right ???

thank you(: