**Quote:**

It is currently 1:30 pm, which is the same time as 13:30 am. Add 23 hours and one gets 12:30am. Answer A.

If you convert the question into 24-hour clock system, it will be:

If the time is currently 13:30, what time will it be in exactly 647 hours?

A. 00:30

B. 1:30

C. 12:30

D. 14:30

E. 22:30

One hour before 13:30 is 12:30 (which is the same as 23 hours after 13:30). The correct answer is C.

Note, the 24-hour clock system does not have "am" and "pm" abbreviations.