document.write( "Question 1158942: Jeff bicycles 120 miles at the rate of r mph. The same trip would have taken 5 hours longer if he had decreased his speed by 4 mph. Find r.\r
\n" ); document.write( "\n" ); document.write( "I thought it would be 120/(r-4)-120r=5. It doesn't make sense when I work it out \n" ); document.write( "

Algebra.Com's Answer #781919 by ikleyn(53765) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "The \"time\" equation is\r\n" );
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document.write( "     -  = 5 hours longer.\r\n" );
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document.write( "Reduce it to a quadratic equation and solve it formally.\r\n" );
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document.write( "Or guess the answer mentally:  r = 12 miles per hour.    ANSWER\r\n" );
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document.write( "CHECK.   -  =  -  = 15 - 10 = 5 hours.   ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved/explained/answered.\r
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\n" ); document.write( "\n" ); document.write( "If you still have questions, do not hesitate to post them to me.\r
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\n" ); document.write( "\n" ); document.write( "Please refer to the problem ID number 1158942.\r
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