Question
Harry took 2 hours to walk from Building R to Building S which was 10 km away. On his way back from Building S to Building R, 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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Harry took 2 hours to walk from Building R to Building S which was 10 km away. On his way back from Building S to Building R, he increased his average walking speed by 2 km/h. How long did he take for his journey back?