document.write( "Question 171029: Two cars leave from New York and drive in opposite directions (north and south). The car going north travels at 60 mph. The car going south leaves an hour and a half after the first and goes 80 mph. At what time will the cars be 620 miles apart? This is a homework problem on a sheet of paper so not from a book. I tried it and got 32 hours 30 minutes but I don't think that it's right. \n" ); document.write( "
Algebra.Com's Answer #126260 by checkley77(12844)![]() ![]() ![]() You can put this solution on YOUR website! LET 60*T= THE NORTH CAR. \n" ); document.write( "LET 80(T-1.5)= THE SOUTH CAR. \n" ); document.write( "60T+80(T-1.5)=620 \n" ); document.write( "60T+80T-120=620 \n" ); document.write( "140T=620+120 \n" ); document.write( "140T=740 \n" ); document.write( "T=740/140 \n" ); document.write( "T=5.2857 HOURS AFTER THE CAR GOING NORTH STARTED THEY WILL BE 620 MILES APART \n" ); document.write( "PROOF: \n" ); document.write( "60*5.2857+80(5.2857-1.5)=620 \n" ); document.write( "317.14285+80*3.7857=620 \n" ); document.write( "317.14285+302.856=620 \n" ); document.write( "620~620 \r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |