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At 6′o a clock ticks 6 times. The time between first and last ticks is 30 seconds. How long does it tick at 12′o clock

40
70
66
56
Explanation:
For ticking 6 times, there are 5 intervals.
Each interval has time duration of 30/5 = 6 secs
At 12 oclock, there are 11 intervals,
So total time for 11 intervals = 11 × 6 = 66 secs.
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