How many times do the hour hand and the minute hand of a clock coincide between 6:00 a.m. and 6:00 p.m. on the same day?
A. 12
B. 10
C. 22
D. 11
A. 12
B. 10
C. 22
D. 11
Best answer
Answer: D. 11
Answer: (D) 11
The hands coincide every \(\frac{720}{11} = 65\frac{5}{11}\) minutes, i.e. 11 times in any 12 hours. At 6:00 they are opposite (not together), and the 11 meetings fall at about 6:33, 7:38, 8:44, 9:49, 10:55, 12:00 noon, 1:05, 2:11, 3:16, 4:22 and 5:27. So the answer is 11 (12 would wrongly count a meeting at 6:00).
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