document.write( "Question 1152719: airplane at 19,200 feet descending at a rate of 40 feet per second. Another airplane takes off and ascends at a rate of 60 feet per second. After how many seconds will the airplanes be at the same height? What is the height? \n" ); document.write( "

Algebra.Com's Answer #774797 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "Your equation is\r\n" );
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document.write( "    19200 - 40x = 60x\r\n" );
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document.write( "expressing rime x in seconds when the heights are equal.\r\n" );
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document.write( "Simplify and solve\r\n" );
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document.write( "    19200 = 60x + 40x\r\n" );
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document.write( "    19200 = 100x\r\n" );
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document.write( "    x =  = 192 seconds.    \r\n" );
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