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It took Fangfang four hours to go to work by car from home and four hours to come back from work, driving faster than when she came.

Full length per hour when you go.

1 ÷ 6 = 1 in 6。

Come back every hour, whole body

1 ÷ 4 = 1 in 4。

Full length is

8 ÷ (1- 1) = 96 (km)

The round trip distance is

96× 2 =192km

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