document.write( "Question 1192917: ``When a plane flies with the wind, it can travel 1680 miles in 4 hours. When the plane flies in the opposite direction, against the wind, it takes 5 hours to fly the same distance. Find the rate of the plane in still air and the rate of the wind.\r \n" );
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document.write( "The rate of the wind is ____ miles per hour.''. \n" );
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