<PRE><B>Question 95516</B>
The elevator in the Washington Monument takes 75 seconds to travel 500 ft. to the top floor. What is the speed of the elevator in miles per hours? Give your answers to two significant 
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500 ft/75 seconds (3600 seconds/1 hr.)(1 mi/5280 ft) 
Notice that the feet cancel and the seconds cancel leaving you with:
= [500*3600*1]/[75*1*5280] (mi/hr)
= [1800000]/[395000] mi/hr
= 4.55 mi/hr
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Cheers,
Stan H. </PRE>