A train travels from City A to City B at a speed of 60 miles per hour. The distance between the two cities is 180 miles. On the return trip, the train travels at a speed of 90 kilometers per hour. How much total time, in hours, does the train spend traveling between the two cities, including both trips? (Note: 1 mile = 1.60934 kilometers) Let's think step by step and output the final answer within \boxed{}.
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