document.write( "Question 1140673: Two persons travel by car to separate cities in the same amount of time. The first person travels 310 km sat an average speed that is three kms per hour faster than the second person. The second person travels 215 kms. What is the average speed of the slower car?\r
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Algebra.Com's Answer #761200 by ikleyn(52814) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Let x be the average speed of the slower car, in kilometers per hour.\r\n" );
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document.write( "Then the faster car's average speed is (x+3) km/h.\r\n" );
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document.write( "The \"time\" equation is\r\n" );
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document.write( "     = .      { \" in the same amount of time \" )\r\n" );
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document.write( "Solve it for x.\r\n" );
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document.write( "For it, cross multiply to get\r\n" );
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document.write( "    310*x = 215*(x+3)\r\n" );
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document.write( "    310x = 215x + 645\r\n" );
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document.write( "    310x - 215x = 645\r\n" );
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document.write( "    95x = 645\r\n" );
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document.write( "    x =  = 6.8 kilometers per hour (approximately).\r\n" );
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document.write( "Very strange answer, for the car' speed - but such are the input data in your post.\r\n" );
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