document.write( "Question 869679: Two automobiles start at the same time at the same place and travel in opposite directions. One travels at the rate of 45 km/h and the other at the rate of 40 km/h. In how many hours will they be 255 km apart. \n" ); document.write( "

Algebra.Com's Answer #524550 by LinnW(1048) $\"\"$ $\"About$

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They are moving away from each other at the combined rate of (45+40)km/h or
\n" ); document.write( "85km/h
\n" ); document.write( "Since distance = rate * time ,
\n" ); document.write( " 255 = 85 * time
\n" ); document.write( "divide each side by 85
\n" ); document.write( " 255/85 = time
\n" ); document.write( " 3 = time in hours
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