document.write( "Question 789359: A car traveling at 8o kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 seconds the two cars are 500 meters apart. Find the speed of the second car. \n" ); document.write( "
Algebra.Com's Answer #478831 by mananth(16946)\"\" \"About 
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A car traveling at 8o kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 seconds the two cars are 500 meters apart. Find the speed of the second car.\r
\n" ); document.write( "\n" ); document.write( "speed of car II -x mph
\n" ); document.write( "speed of car I = 80 kph\r
\n" ); document.write( "\n" ); document.write( "Difference = (x-80)\r
\n" ); document.write( "\n" ); document.write( "distance between them = 0.5 km
\n" ); document.write( "after time (30/3600) hours\r
\n" ); document.write( "\n" ); document.write( "d=rt\r
\n" ); document.write( "\n" ); document.write( "0.5 = (x-80) * (30/3600)\r
\n" ); document.write( "\n" ); document.write( "0.5 * 3600 = 30(x-80)\r
\n" ); document.write( "\n" ); document.write( "0.5 * 3600/30 = x-80\r
\n" ); document.write( "\n" ); document.write( "60=x-80
\n" ); document.write( "x= 80 +60
\n" ); document.write( "x= 140 km/h\r
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