Two vehicles leave the same location at exactly the same time, the first traveling due west and the second traveling due east. In how many hours will the two vehicles be 390 miles apart? (1)The average speed of the first vehicle is 10 miles per hour faster than the average speed of the second vehicle. (2)When the two vehicles are 390 miles apart, the second vehicle has gone a distance of 180 miles.

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Two vehicles leave the same location at exactly the same time, the first traveling due west and the second traveling due east. In how many hours will the two vehicles be 390 miles apart? (1)The average speed of the first vehicle is 10 miles per hour faster than the average speed of the second vehicle. (2)When the two vehicles are 390 miles apart, the second vehicle has gone a distance of 180 miles.