document.write( "Question 442892: A plane flew 480 miles at a certain speed; and then increased its speed by 20 miles per hour, and continued on the same course. After having flown a total distance of 840 miles in a total of 5 hours, it landed. What was the original speed of the plane? \n" ); document.write( "
Algebra.Com's Answer #305730 by rwm(914)![]() ![]() ![]() You can put this solution on YOUR website! 840-480=360 \n" ); document.write( "r*t=d \n" ); document.write( "a+b=5 \n" ); document.write( "r*a=480 \n" ); document.write( "(r+20)*b=360 \n" ); document.write( "solve for r\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |