Question
Pierre took 3 hours to walk from Building L to Building M which was 9 km away. On his way back from Building M to Building L, he increased his average walking speed by 2 km/h. How long did he take for his journey back?
3 m

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Pierre took 3 hours to walk from Building L to Building M which was 9 km away. On his way back from Building M to Building L, he increased his average walking speed by 2 km/h. How long did he take for his journey back?