Diameter of each wheel $\"\"$ inches.

Convert from inches to feet :

$\"\"$ .

Determine the circumference of the wheel by using the diameter.

Circumference $\"\"$ .

Every time the wheel makes one complete rotation, the bike travels $\"\"$ $\"\"$ .

Convert from miles to feet :

$\"\"$ .

Determine the number of revolutions per hour, by dividing $\"\"$ mph by the circumference of the wheel. $\"\"$ Finally, convert hours to minutes to get the rpm :

$\"\"$ .

Therefore, the number of revolutions $\"\"$ .

The number of revolutions $\"\"$ .