document.write( "Question 1095725: Two cars start at the same time, but travel in opposite directions. One car's average speed is 70 miles per hour (mph). At the end of 5 hours, the two cars are 600 miles apart. Find the average speed in mph of the other car. \n" ); document.write( "
Algebra.Com's Answer #710248 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"+s+\" = the speed of the other car
\n" ); document.write( "Think of this as one of the cars standing
\n" ); document.write( "still and the other moving at the sum
\n" ); document.write( "of their speeds
\n" ); document.write( "--------------------------------------
\n" ); document.write( "\"+600+=+%28+70+%2B+s+%29%2A5+\"
\n" ); document.write( "\"+600+=+350+%2B+5s+\"
\n" ); document.write( "\"+5s+=+250+\"
\n" ); document.write( "\"+s+=+50+\"
\n" ); document.write( "The average speed of the other car is 50 mi/hr
\n" ); document.write( "--------------------
\n" ); document.write( "check:
\n" ); document.write( "\"+d%5B1%5D+=+70%2A5+\"
\n" ); document.write( "\"+d%5B1%5D+=+350+\"
\n" ); document.write( "and
\n" ); document.write( "\"+d%5B2%5D+=+50%2A5+\"
\n" ); document.write( "\"+d%5B2%5D+=+250+\"
\n" ); document.write( "and
\n" ); document.write( "\"+d%5B1%5D+%2B+d%5B2%5D+=+350+%2B+250+\"
\n" ); document.write( "\"+d%5B1%5D+%2B+d%5B2%5D+=+600+\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" );