document.write( "Question 423288: An airplane flew for 3 hours with a tail wind of 18 kilometers per hour. The return flight against the wind took 4 hours. Find the rate of the plane in still air. \n" ); document.write( "
Algebra.Com's Answer #853219 by josgarithmetic(39702)\"\" \"About 
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r, how fast if no wind\r
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\n" ); document.write( "\n" ); document.write( "\"%28r%2B18%29%283%29\" distance one way\r
\n" ); document.write( "\n" ); document.write( "\"%28r-18%29%284%29\" distance going back\r
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\n" ); document.write( "\n" ); document.write( "\"3%28r%2B18%29=4%28r-18%29\"\r
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