document.write( "Question 1077250: A private plane and a commercial plane take off from an airport at the same time for a city 720 km away. The speed of the private plane is 180km/h less than that of a commercial plane. If the commercial plane arrives 2 hours ahead of the private plane , find each planes rate . \n" ); document.write( "
Algebra.Com's Answer #691761 by addingup(3677)\"\" \"About 
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speed of the commercial plane: x
\n" ); document.write( "speed of the private plane: x-180
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\n" ); document.write( "x+x-180 = 720
\n" ); document.write( "2x = 900
\n" ); document.write( "x = 450
\n" ); document.write( "So, the speed of the commercial plane is 450km/h and the speed of the private plane is 450-180 = 270km/h
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