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