<p>EDIT: I see what the question is asking, but it’s not very good.</p>
<p>It’s saying when will the broken clock’s pointer be on the real time. (what I said is confusing, but I will explain). Since you already know the answer now, you could use 18 hours and add that to 12 noon, which would be 6 AM. For the broken clock in 18 hours it’s pointer will move 6 hours, which will be at 6.</p>