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44 times.

Starting at 12 o'clock, over the next 12 hours, the hour hand will make a 90o angle to the right (like quarter past) 11 times and 90o angle to the left (like quarter to) making a total of 22 times per 12 hours, or 44 per 24 hours aka 1 day.

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12y ago
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Q: How many times do the minute hand and the hour hand of a clock make an angle of 90 degree in a day?
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