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The angle between the hour hand and the minute hand is 90o at 9 o"clock and 3 o"clock:
How many times between 9 a.m. and 3 p.m. is the angle between the hour and minute hand 90o?
Problem ID: 137 (Dec 2003) Difficulty: 2 Star
The angle between the hour hand and the minute hand is 90o at 9 o"clock and 3 o"clock:
How many times between 9 a.m. and 3 p.m. is the angle between the hour and minute hand 90o?
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