document.write( "Question 991078: Car a and car b enter an expressway at the same time and place, and head the same direction. Car a travels at70 miles per hour. After 2.5 hours, car b is 50 miles behind car a. At what speed is car b traveling \n" ); document.write( "
Algebra.Com's Answer #611023 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Car a and car b enter an expressway at the same time and place, and head the same direction.
\n" ); document.write( " Car a travels at70 miles per hour.
\n" ); document.write( " After 2.5 hours, car b is 50 miles behind car a.
\n" ); document.write( " At what speed is car b traveling
\n" ); document.write( ":
\n" ); document.write( "let b = the speed of car b
\n" ); document.write( ":
\n" ); document.write( "Write a distance equation; dist = speed*time
\n" ); document.write( ":
\n" ); document.write( "a's dist - b's dist = 50 mi
\n" ); document.write( "2.5(70) - 2.5b = 50
\n" ); document.write( "175 - 2.5b = 50
\n" ); document.write( "-2.5b 50 - 175
\n" ); document.write( "-2.5b = - 125
\n" ); document.write( "b = -125/-2.5
\n" ); document.write( "b = 50 mph the speed of car b
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "See if that checks out
\n" ); document.write( "a travels 175 mi
\n" ); document.write( "b travels 2.5*50 = 125 mi, difference of 50 mi \n" ); document.write( "
\n" );