document.write( "Question 347104: if a plane can travel 480mph with the wind and 380 against the wind, what is the plane's speed in still air? \n" ); document.write( "
Algebra.Com's Answer #248196 by Alan3354(69443)\"\" \"About 
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It's the average (480 + 380)/2
\n" ); document.write( "= 430 mph
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\n" ); document.write( "It's called airspeed, not \"speed in still air\"
\n" ); document.write( "And planes use knots, not mph.
\n" ); document.write( "1 knot = 1 nautical mile per hour
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