Asked by Bob

The wheels of a moving bicycle have 27-inch diameters, and they are spinning at 200 revolutions per minute. How fast is the bike traveling in miles per hour?

27*π*200=16964.6
1mi=63360in 63360/16964.6=3.73

I am not sure if i did it right
Answered by bobpursley
You figured out miles per minute, not mph, right?
Answered by Bob
so i divide it by 60?
Answered by Steve
You figured out min/mile. Keep track of the units!

16964.6 in/min * 1mi/63360in = 0.2677 mi/min

Now multiply that by 60min/hr to get mi/hr.