A cyclist travels from Town A to Town B, a distance of 120 miles, at an average speed of \( x \) miles per hour. On the return trip, due to fatigue, the cyclist's average speed decreases by 5 miles per hour. The total time for the round trip is 10 hours. Find the cyclist's average speed on the initial trip from Town A to Town B. Let's think step by step and output the final answer within \boxed{}.
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