Question
Liam took 4 hours to walk from Building Z to Building A which was 4 km away. On his way back from Building A to Building Z, 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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Liam took 4 hours to walk from Building Z to Building A which was 4 km away. On his way back from Building A to Building Z, he increased his average walking speed by 1 km/h. How long did he take for his journey back?