document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=206885>Question 206885</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Your bike has 26\" tires (diameter). The ratio for turns is 3:1 ( the wheel turns 3 times when you pedal once). You can pedal 50 times per minute. How long will it take to ride a 10km race? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #156381 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=156381\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Your bike has 26\" tires (diameter). The ratio for turns is 3:1 ( the wheel turns 3 times when you pedal once). You can pedal 50 times per minute. How long will it take to ride a 10km race?<BR>\n" );
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document.write( "Circumference = 26pi inches<BR>\n" );
document.write( "Pedalling 50 rpm turns the wheel at 150 rpm<BR>\n" );
document.write( "150*26pi = 7800pi in/min<BR>\n" );
document.write( "= 7800pi*2.54 cm/min<BR>\n" );
document.write( "= 78pi*2.54 meters/min<BR>\n" );
document.write( "= 1/(2.54*78pi) minutes/meter<BR>\n" );
document.write( "10000 meters --> 10000/2.54*78pi minutes<BR>\n" );
document.write( "= ~ 16.06 minutes<BR>\n" );
document.write( " </SPAN>\n" );
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