Question
Opal and Irene started walking at 7.20 a.m. Opal walked for 10 min while Irene walked thrice as long as Opal. At what time did Irene finish her walk?
4 m

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Opal and Irene started walking at 7.20 a.m. Opal walked for 10 min while Irene walked thrice as long as Opal. At what time did Irene finish her walk?