Question 1089534
The tires on a car have a diameter of 27 inches.
 The car runs over a pebble, which sticks inside the tread of one of the tires. If the pebble on the tire rotates at a speed of 4 revolutions per second, find the speed of the car in miles per hour.
:
Find the circumference, mult by the rev per sec, times 3600 sec in a hr
Divide by 12 and 5280 
:
{{{((pi*27*4*3600))/((5280*12))}}} = 19.3 mph