document.write( "Question 311695: every time the pedals go through a 360 degree rotation on a certain bike, the tires rotate 3 times. if the tires are 24 inches in diameter, what is the minimum number of complete rotations of the pedals needed for the bike to travel atleast 1 mile?
\n" ); document.write( "1) 12
\n" ); document.write( "2) 281
\n" ); document.write( "3) 561
\n" ); document.write( "4) 5,280 \n" ); document.write( "

Algebra.Com's Answer #222936 by mananth(16946) $\"\"$ $\"About$

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The diameter of the tyre is 24 inches\r
\n" ); document.write( "\n" ); document.write( "radius = 12 inches.\r
\n" ); document.write( "\n" ); document.write( "the circumference = 2*pi*r
\n" ); document.write( "=2*pi*12
\n" ); document.write( "=75.4 inches\r
\n" ); document.write( "\n" ); document.write( "If the cycle has to go 1 mile it has to go 63360 inches\r
\n" ); document.write( "\n" ); document.write( "the number of revolutions the tyre has to make = 63360 / 75.4
\n" ); document.write( "= 840.31 revolutions\r
\n" ); document.write( "\n" ); document.write( "if the tyre makes 840.31 revolutions the the pedal has to make \r
\n" ); document.write( "\n" ); document.write( "840.31 / 3
\n" ); document.write( "= 280.1 revolutions
\n" ); document.write( "OR 281 revolutions\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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