Question 463968
at 10am a plane leaves Boston,Massachusetts, for Seatle,Washington, a distance of 3000mi.One hour later a plane leaves Seatle for Boston. Both planes are traveling at a speed of 5000mph.How many hours after the plane leaves Seatle with the planes pass each other? 
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They travel 3000 miles at 10000 miles/hr
3000/10000 = 0.3 hours
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Those are fast planes.