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To find out how soon the two buses will be 872 miles apart, we can divide the distance by the combined rate at which they are moving away from each other.
Total rate of the two buses traveling in opposite directions = 56 mph + 53 mph = 109 mph
Time = Distance / Rate
Time = 872 miles / 109 mph
Dividing 872 miles by 109 mph results in 8 hours.
Therefore, the two buses will be 872 miles apart in 8 hours.