The starting price of a taxi in a city is 8 yuan (within 3 kilometers), more than 3 kilometers, with an average of 1.8 yuan per kilometer. Dongdong pays 13.4 yuan from home to Wal Mart. How far is Dongdong from Wal Mart?

13.4-8 = 5.4 yuan
5.4÷1.8=3
3 + 3 = 6 km

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