document.write( "Question 658503: a plane can travel 3120 miles in 6.5 hours with a headwind. on the return trip, the trip takes 6 hours. find the speed of the plane in still air \n" ); document.write( "
Algebra.Com's Answer #410303 by checkley79(3341)\"\" \"About 
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D=RT
\n" ); document.write( "3120=X*6.5
\n" ); document.write( "6.5X=3120
\n" ); document.write( "X=480 MPH AGAINST THE WIND.
\n" ); document.write( "3120=X*6
\n" ); document.write( "6X=3120
\n" ); document.write( "X=3120/6
\n" ); document.write( "X=520 MPH WITH THE WIND.
\n" ); document.write( "(520-480)/2=900/2=450 MPH IS THE SPEED OF THE PLANE IN STILL AIR.\r
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