document.write( "Question 985664: two planes leave Chicago. ONE HEADS WEST AT 410 MPH AT 10:00 AND THE OTHER HEADS EAST AT 370 MPH 15 MINUTES LATER. At what time will the planes be 4119.5 miles apart? \n" ); document.write( "

Algebra.Com's Answer #606495 by Edwin McCravy(20065) $\"\"$ $\"About$

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document.write( "15 minutes = 0.25 hours\r\n" );
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document.write( "First plane travels 410(0.25) = 102.5 miles during 1st 15 minutes\r\n" );
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document.write( "They are 102.5 miles apart when the second plane starts.\r\n" );
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document.write( "Their rate of separation is 410+370 = 780 MPH\r\n" );
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document.write( "They are already separated by 102.5 miles.  \r\n" );
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document.write( "We want to know when they will have separated 4119.5-102.5 or 4017 more\r\n" );
document.write( "miles:\r\n" );
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document.write( " hours or 5 hours 9 minutes after\r\n" );
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document.write( "2nd plane takes off.\r\n" );
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document.write( "Edwin

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