Question
Xuan and Mary started walking at 5.15 a.m. Xuan walked for 10 min while Mary walked four times as long as Xuan. At what time did Mary finish her walk?
4 m

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Xuan and Mary started walking at 5.15 a.m. Xuan walked for 10 min while Mary walked four times as long as Xuan. At what time did Mary finish her walk?