document.write( "Question 57: After leaving Moose Jae, Hanson drove 100 kilometers at x km/hr and then decreased his speed by 20 km/hr and drove another 200 additional kilometers. Write a rational expression for his total traveling time.\r
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Algebra.Com's Answer #25 by AnlytcPhil(1806)\"\" \"About 
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>>...After leaving Moose Jae, Hanson drove 100 kilometers at 
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document.write( "x km/hr and then decreased his speed by 20 km/hr and drove 
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document.write( "another 200 additional kilometers. Write a rational expression 
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document.write( "for his total traveling time.<< \r
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document.write( "Use TIME = DISTANCE/SPEED\r
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document.write( ">>...drove 100 kilometers at x km/hr...<<\r
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document.write( "Translation: TIME to travel the 100 kilometers = DISTANCE/SPEED
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document.write( "or 100/x
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document.write( ">>...decreased his speed by 20 km/hr and drove another 200 
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document.write( "additional kilometers...<<\r
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document.write( "Translation: He decreased his speed from x km/hr to (x-20) km/hr
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document.write( "So the TIME for the 200 additional kilometers = DISTANCE/SPEED
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document.write( "or 200/(x-20)\r
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document.write( "So:\r
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document.write( "Total TIME = TIME to travel the 100 km + TIME to travel the 200 km
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document.write( "TOTAL TIME = 100/x + 200/(x-20)
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document.write( ">>...Evaluate the expression if x=100...<<
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document.write( "TOTAL TIME = 100/100 + 200/(100-20)
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document.write( "           = 1 + 200/80
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document.write( "           = 1 + 2.5 
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document.write( "           = 3.5 hours.\r
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document.write( "Edwin J\n" );
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