Question 135599
I need to convert 15 mi/hr to ft/sec. 
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change the miles to ft using (5280 ft)/(1 mile)
change the hours to seconds using (1/hr/3600 sec)
Each of these fraction = "1" so multiplying by them changes only the units.
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(15mi/hr)(5280 ft)/1 mi)(1 hr/3600 sec)
= [15*5280*1 ft]/[1*1*3600 sec] = 79200 ft/3600sec = 22 ft/sec
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Cheers,
Stan H.