Bob breaks up a 220-mile trip into three parts. If the first part of the trip is 20 miles longer than the second part of the trip, and the third part of the trip is 50 miles longer than the second part of the trip, how many miles was the second part of the trip?

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Bob breaks up a 220-mile trip into three parts. If the first part of the trip is 20 miles longer than the second part of the trip, and the third part of the trip is 50 miles longer than the second part of the trip, how many miles was the second part of the trip?