document.write( "Question 821494: A plane travels 84 miles in 20 minutes. What is the average speed of the plane? \n" ); document.write( "
Algebra.Com's Answer #494152 by Alan3354(69443)\"\" \"About 
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A plane travels 84 miles in 20 minutes. What is the average speed of the plane?
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\n" ); document.write( "d = r*t
\n" ); document.write( "r = d/t
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