document.write( "Question 437247: Train A leaves a station traveling 20mph. Four hours later train B leaves the station traveling in the same direction at 30mph. How long does it take train B to catch up to train A \n" ); document.write( "

Algebra.Com's Answer #302447 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( " Four hours later train B leaves 
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document.write( "Let x and (x+4) represent time train B and A traveled respectively
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document.write( "Question states*** NOte: D = r*t, Distances same for both A and B
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document.write( " 20mph*(x+4) = 30mph*x
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document.write( "       80 = 10x
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document.write( "      x = 8hrs, time it takes train B to catch up to train A \r
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document.write( " CHECKING our Answer***
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document.write( " 20mph*12hr = 30mph*8hr = 240mi \n" );
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