For 6:00 clock there, time elapsed = 22 seconds

So, to stroke 6, 5 empty time slots would be required

Total = 6 + 5 = 11 slots

So one slot will require = 22/11 = 2 seconds.

We can also generalize this information by putting in a formula:

For n time, it will be n + n-1 = (2n-1)

Time elapsed between First & Last Stroke = (2n-1) x 2 where

n = Time displayed

So for 12'o clock, it would be (24-1) x 2 = 46 = Answer = D

Bunuel, can you please tell if this approach is correct.

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