Mathematics
Where will the hour hand of a clock stop if it starts from 10 and turns through 3 right angles?
Lines & Angles
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Answer
1 right angle = of a revolution = 3 hours (since one full revolution = 12 hours).
3 right angles = 3 × 3 = 9 hours.
Starting from 10 and moving 9 hours clockwise:
10 → 11 → 12 → 1 → 2 → 3 → 4 → 5 → 6 → 7
∴ The hour hand will stop at 7.
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