Question
Charlie took 2 hours to walk from Building C to Building D which was 8 km away. On his way back from Building D to Building C, he increased his average walking speed by 1 km/h. How long did he take for his journey back?
3 m

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Charlie took 2 hours to walk from Building C to Building D which was 8 km away. On his way back from Building D to Building C, he increased his average walking speed by 1 km/h. How long did he take for his journey back?