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)\"\" \"About 
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
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