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