Question
Simon took 3 hours to walk from Building S to Building T which was 6 km away. On his way back from Building T to Building S, 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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Simon took 3 hours to walk from Building S to Building T which was 6 km away. On his way back from Building T to Building S, he increased his average walking speed by 1 km/h. How long did he take for his journey back?