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Dave drives from point A to point B, on his first trip, taking 3 hours. The...

Dave drives from point A to point B, on his first trip, taking 3 hours. The second time he takes the trip, he increases his average speed by 5 miles per hour and makes the trip in 18 fewer minutes. The third time, he increases his average speed by 10 miles per hour compared to his second trip. How long did he take the third time he made the trip?

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