Please solve the following question:

A state employee drove from Lake Charles to a conference in Baton Rouge. A total distance from the round trip was 240 miles. The time required to travel one way to Baton Rouge was two hours. Due to heavy traffic during the return trip to Lake Charles, an extra hour was required. How much slower was the state employee traveling on the return trip.

I have the answer but do not how it was derived. I would like a breakdown of the answer.

Thank you for your most kind assistance.

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