Question 1004443
when they meet the distance travveled by both is same

let that distance be x

cargo plane left at 12.00 
speed = 400 mph
x/400 is the time taken by the cargo plane
x/t = 400
x=400t

Passenger jet left at 2.00 
time time taken = t-2
speed = 560 mph

x/(t-2) = 560

x= 560(t-2)
400t=560(t-2)

400t = 560t-1120
160t = 1120
t = 7 hours

d=rt
d=400*7= 2800 miles

they flew 2800 miles