document.write( "Question 1066484: Imogene's car traveled 360 mi averaging a certain speed. If the car had gone 5 mph faster, the trip would have taken 1 hour less. Find the average speed. \n" ); document.write( "

Algebra.Com's Answer #681661 by ikleyn(52803) $\"\"$ $\"About$

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document.write( " = 1,\r\n" );
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document.write( "360*(u+5) - 360u = u*(u+5),\r\n" );
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document.write( "360u + 1800 - 360u = u^2 + 5u,\r\n" );
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document.write( "u^2 + 5u - 1800 = 0.\r\n" );
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document.write( "(u+45)*(u-40) = 0.\r\n" );
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document.write( "Answer. 40 mph.\r\n" );
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