Question
Min starts her violin class at 6 o'clock in the evening. She ends her lesson at 9 o'clock on the same evening. How many right angles will the minute hand make at the end of the lesson?
2 m

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Min starts her violin class at 6 o'clock in the evening. She ends her lesson at 9 o'clock on the same evening. How many right angles will the minute hand make at the end of the lesson?