Question
Jack took 3 hours to walk from Building W to Building X which was 6 km away. On his way back from Building X to Building W, 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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Jack took 3 hours to walk from Building W to Building X which was 6 km away. On his way back from Building X to Building W, he increased his average walking speed by 2 km/h. How long did he take for his journey back?