document.write( "Question 1156500: A tour bus normally leaves for its destination at 5:00 p.m. for a 378 mile trip. This week however, the bus leaves at 6:00 p.m. To arrive on time, the driver drives 9 miles per hour faster than usual. What is the bus` usual speed? \n" ); document.write( "

Algebra.Com's Answer #779208 by ikleyn(52782) $\"\"$ $\"About$

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document.write( "Let x be the regular speed.\r\n" );
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document.write( "Then the time equation is\r\n" );
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document.write( "     -  = 1.\r\n" );
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document.write( "Multiply both sides by x*(x+9); then reduce to the standard quadratic equation.\r\n" );
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document.write( "Then solve it by any way you want/(you can).\r\n" );
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