A cable railway had a 12-foot-diameter pulley to drive the cable (see the figure). In order to keep the cable cars moving at a linear velocity of 9 miles per hour, how fast would the pulley need to turn (in revolutions per minute)? (1 mi = 5,280 ft)
?
?
A. 23.2 rpm
B. 24.5 rpm
C. 15.3 rpm
D. 28.1 rpm
E. 21.0 rpm
Answer: E
Mathematics
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