document.write( "Question 303210: The tip of a blade of an electric fan is 1.5 feet from the axis of rotation . if the fan spins at a full rate of 1,160 revolutions per minute, how many miles will a point at the tip of a blade travel in one hour ? (1 mile = 5,280 feet)\r
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Algebra.Com's Answer #217315 by CharlesG2(834)\"\" \"About 
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The tip of a blade of an electric fan is 1.5 feet from the axis of rotation . if the fan spins at a full rate of 1,160 revolutions per minute, how many miles will a point at the tip of a blade travel in one hour ? (1 mile = 5,280 feet)\r
\n" ); document.write( "\n" ); document.write( "a 30pi b 40 pi c 45 pi d 48 pi e 60 pi\r
\n" ); document.write( "\n" ); document.write( "C circumference = 2piR
\n" ); document.write( "R radius = 1.5 ft
\n" ); document.write( "C = 2 * pi * 1.5 = 3pi ft
\n" ); document.write( "1160 * rev/min * 3pi * ft/rev = 1160 * 3pi = 3480pi feet/minute
\n" ); document.write( "3480pi * feet/minute * 1/5280 * mile/feet = (3480/5280)pi miles/minute
\n" ); document.write( "3480/5280 = 348/528 = 174/264 = 87/132
\n" ); document.write( "(87/132)pi * miles/minute * 60 * minutes/hour = (87/132) * 60 * pi miles/hr
\n" ); document.write( "approx 39.55 pi miles/hr
\n" ); document.write( "so b. 40pi\r
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