document.write( "Question 761799: You can ride a bicycle 15 mph. Your sister rides 12 mph. You give her a one hour head start. In how many hours will you catch up if neither of you stops? \n" ); document.write( "
Algebra.Com's Answer #463496 by jim_thompson5910(35256)\"\" \"About 
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12x=15(x-1)\r
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\n" ); document.write( "\n" ); document.write( "12x=15x-15\r
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\n" ); document.write( "\n" ); document.write( "12x-15x=-15\r
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\n" ); document.write( "\n" ); document.write( "-3x=-15\r
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\n" ); document.write( "\n" ); document.write( "x=(-15)/(-3)\r
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\n" ); document.write( "\n" ); document.write( "x=5\r
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\n" ); document.write( "\n" ); document.write( "So 5 hours total will pass by, but for you, 5-1 = 4 hours pass by (since she got the 1 hr head start). So it will take you 4 hours to catch up to her (after you start riding).
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