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