document.write( "Question 656174: From a point on a straight road, two cars are driven in opposite directions, one at 21 miles per hour and the other at 20 miles per hour. In how many hours will they be 164 miles apart?\r
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Algebra.Com's Answer #409445 by MathTherapy(10553)\"\" \"About 
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\n" ); document.write( "From a point on a straight road, two cars are driven in opposite directions, one at 21 miles per hour and the other at 20 miles per hour. In how many hours will they be 164 miles apart?\r
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\n" ); document.write( "\n" ); document.write( "Distance (D) = speed (S) or rate (R) , times time (T)
\n" ); document.write( "D = S * T ----- T = D/S\r
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\n" ); document.write( "\n" ); document.write( "In this case, S, or speed = sum of the two vehicles' speeds\r
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\n" ); document.write( "\n" ); document.write( "Therefore, T, or time = 164/(21 + 20)\r
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\n" ); document.write( "\n" ); document.write( "Distance traveled by faster vehicle, plus distance traveled by slower vehicle equals distance that both vehicles are apart, after a certain period of time\r
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\n" ); document.write( "\n" ); document.write( "This results in: 21T + 20T = 164. Solve for T, and you have the time.\r
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\n" ); document.write( "\n" ); document.write( "Send comments and “thank-yous” to “D” at MathMadEzy@aol.com
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