document.write( "Question 1157562: Annette drives her car 140 miles and has an average of a certain speed. If the average speed had been 3mph more, she could have traveled 147 miles in the same length of time. What was her average speed?\r
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Algebra.Com's Answer #780437 by ikleyn(52879) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "The condition gives you THIS \"time\" equation\r\n" );
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document.write( "     = .\r\n" );
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document.write( "where \"x\" is the unknown speed value under the problem's question.\r\n" );
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document.write( "Cross multiply and solve\r\n" );
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document.write( "    140*(x+3) = 147x\r\n" );
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document.write( "    140x + 140*3 = 147x\r\n" );
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document.write( "    140*3 = 147x - 140x\r\n" );
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document.write( "    140*3 = 7x\r\n" );
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document.write( "    x =  = 20*3 = 60 mph.    ANSWER\r\n" );
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