6th Grade Itinerary Problems Using Ratios: Problem 4

Problem: A train runs from City A to City B. In its first year, it took 19.5 hours to go from City A to City B. After its first improvement, its speed was raised by the original's 20%. After two more improvements, the speed was raised by the original's 25%, and then 30%. After this third improvement, how long did it take to travel on this train from City A to City B?

Key: Write fractions instead of ratios

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