Question
Risa started swimming at 10 00. Betty started swimming 10 min later but stopped swimming 4 min earlier than Risa. Risa stopped swimming at 11 05. How long did Betty swim? Give your answer in this format. (Eg 1 h 20 min)
2 m

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Risa started swimming at 10 00. Betty started swimming 10 min later but stopped swimming 4 min earlier than Risa. Risa stopped swimming at 11 05. How long did Betty swim? Give your answer in this format. (Eg 1 h 20 min)