Question 801508
The wheels on a certain bicycle have a radius of 13.2 inches. Suppose the wheels roll at 150 revolutions per minute along flat ground without slipping. How fast is the bicycle moving in miles per hour? 
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Use dimensional analysis method
rev=revolution
r=radius of wheel=13.2 inches
circumference of wheel=2*π*r
.. 
{{{150(rev/min)*2*pi*r(inches/rev)*(ft/12 inches)*60(min/hr)*(mile/5280 ft)}}}
rev,min,inches,ft cancel out, leaving:
{{{(150*2*pi*r*60/(12*5280))(miles/hr)=(150*2*pi*13.2*60/(12*5280))(miles/hr)=11.78(miles/hr)}}}