Question 551208
first plane speed = x
second plane speed = x+40

going away from each other so add up speeds
x+x+40
=2x+40

t=5 hours
d=2000

5=2000/(2x+40)

10x+200=2000
10x=2000-200
10x=1800
/10
x= 180 mph speed of first plane
speed of second plane = 180 +4= 220 mph

Happy New Year
m.ananth@hotmail.ca