Question 92141
75 seconds to travel 500 feet to the top floor.  What is the speed of the elevator in miles per hour? 
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[500 ft/75 seconds][1 mile/5280 ft][3600 seconds/ 1 hr]

= [500*1*3600 [miles]/[75*5280 hr]

= [1800000 miles]/[396000 hrs.] 

= 12.12 mph
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Cheers,
Stan H.