Answer:645 kilometers per hour Solution. Let v be the speed of the plane flying east! Then, the speed of the plane flying west is v+75. Since the planes are 5460 kilometers apart by 7 pm est, (7-3)*(v+(v+75))=5460 2v+75=1365, 2v=1290, v=645 answer: 645
your answer would be 2 hours cause you know its not gonna be neither of the 3 hour cause it says it lasted 3 hours and that was over time and the other 2 was wrong so the answer is 2 hours