SOLUTION: Two planes are 1380 miles apart and traveling toward each other. One plane is traveling 80 mph faster than the other plane. The planes meet in 1.5 hours. Find the speed of each pla

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Question 483140: Two planes are 1380 miles apart and traveling toward each other. One plane is traveling 80 mph faster than the other plane. The planes meet in 1.5 hours. Find the speed of each plane. Please show work.
Found 2 solutions by jorel1380, mananth:
Answer by jorel1380(3719) (Show Source):
You can put this solution on YOUR website!
1.5n+1.5(n+80)=1380
3n+120=1380
3n=1260
n=420
One plane is going 420 mph, the other is going 500 mph..

Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website!
let one plane speed = x
other plane speed = x+80
combined speed = 2x+80
Distance = 1380
time = 1.5
D=rt
1380=(2x+80)1.5
1380/1.5= 2x+80
920=2x+80
2x=920-80
2x=840
x=420 mph speed of one plane
other plane 420+80 = 500 mph
m.ananth@hotmail.ca