document.write( "Question 520014: Kevin's plane flew in a direct line from its base at 480 kph and returned over the same route at a rate of 400 kph, requiring 15 minutes longer on the return trip. How far did it fly from its base? \n" ); document.write( "
Algebra.Com's Answer #345909 by mananth(16946)\"\" \"About 
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returning time - going time = 1/4 hour\r
\n" ); document.write( "\n" ); document.write( "let x be the distance\r
\n" ); document.write( "\n" ); document.write( "x/400 - x/480 = 1/4\r
\n" ); document.write( "\n" ); document.write( "(480x-400x)/400*480 =1/4\r
\n" ); document.write( "\n" ); document.write( "4*80x=400*480
\n" ); document.write( "320x=400*480
\n" ); document.write( "x=(400*480)/320
\n" ); document.write( "x= 600 km\r
\n" ); document.write( "\n" ); document.write( "m.ananth@hotmail.ca
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