document.write( "Question 874266: a car traveling 80 kilometers per houк is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are half a kilometer apart. Find the speed of the second car . \r
\n" ); document.write( "\n" ); document.write( "Hint: D=RT and 30 seconds=1/120hour\r
\n" ); document.write( "\n" ); document.write( "Please set up an equation. Thank you for your help! \n" ); document.write( "
Algebra.Com's Answer #527409 by mananth(16946)\"\" \"About 
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a car traveling 80 kilometers per hour
\n" ); document.write( "time = 30/3600 hours = 1/120 hours
\n" ); document.write( " After 30 seconds,
\n" ); document.write( "d= 80*1/120\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " is passed by a second car going in the same direction at a constant speed.
\n" ); document.write( "let speed be x
\n" ); document.write( " After 30 seconds,
\n" ); document.write( "d= 1/120 * x\r
\n" ); document.write( "\n" ); document.write( " the two cars are half a kilometer apart.\r
\n" ); document.write( "\n" ); document.write( "1/120*x - 80/120 = 1/2\r
\n" ); document.write( "\n" ); document.write( "(x-80)/120 =1/2\r
\n" ); document.write( "\n" ); document.write( "x-80=60
\n" ); document.write( "x=80+60
\n" ); document.write( "x=140 km/h.........speed of second car\r
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\n" ); document.write( "\n" ); document.write( " Find the speed of the second car .
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