SOLUTION: 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?

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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?
Answer by Edwin McCravy(20064)   (Show Source): You can put this solution on YOUR website!
, 

15 minutes = 0.25 hours

First plane travels 410(0.25) = 102.5 miles during 1st 15 minutes

They are 102.5 miles apart when the second plane starts.

Their rate of separation is 410+370 = 780 MPH

They are already separated by 102.5 miles.  

We want to know when they will have separated 4119.5-102.5 or 4017 more
miles:

 hours or 5 hours 9 minutes after

2nd plane takes off.

Edwin
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