<p>This is definitely not a BB problem, hence it is flawed.</p>
<p>If the clock makes no distinction between AM and PM, then the answer is 18. The broken clock would display 6:00 [PM] and a properly functioning clock would display 6:00 <a href=“the%20brackets%20indicate%20that%20AM/PM%20would%20be%20irrelevant”>AM</a>. However, the fact that the problem says “12 noon” indicates that a distinction is should be made (then 36 would be the correct answer). Whether a distinction should be made is not made explicitly clear in the problem, which is a flaw of non BB problems.</p>
<p>Furthermore, when the problem says “In how many hours will it again register the correct time” is it referring to hours passed on the broken clock or on a working clock? Again, it’s not clear.</p>
<p>Bottom line: this problem is crap. Use college board materials ONLY.</p>