<PRE><B>Question 295675</B>
Two planes leave Pittsburgh and Philadelphia at the same time, each going to the other city.  One plane flies 125 miles per hour faster than the other.

Find the ground speed of the faster plane if the cities are 300 miles apart and the planes pass one another after 30 minutes of flying time. Answer in units of mi/h.
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Their combined speed is 300/0.5 = 600 mi/hr
r = the speed of the slower plane
r + r+125 = 600
2r = 475
r = 237.5 mph
2nd plane goes 362.5 mph
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