Math Airplane Riddle?

HenryM

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An airplaneleaves city A flying to City B at the same time another airplane leavesCity B flying to city A.Both are traveling at 550 mph. Five minues later a third airplane leaves City AforCity B flyingf at 600 mph. Thirty six minutes after the second airplane overtakesthe first one from city a to city b it passes the planegoing from City B to City A. What is the distrance from City a to city b.

I got an answer of 690 but idk if i did the problem right or how to do thisproblem
 
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