Train A travelling at 75 mph leaves Sunniville for Gloomyville at 4pm. Train B travelling at 120 mph also leaves Sunniville for Gloomyville at 7pm. Train C leaves Gloomyville for Sunniville at 5pm. If all three trains meet at the same time between Sunniville and Gloomyville, what is the speed of Train C if the distance between Gloomyville and Sunniville is 1160 miles?
a. 90 mph
Pls include reasoning along with all answer posts.
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