Imagine that your watch was correct at noon, but then it began to lose 30 minutes each hour. It now shows 4 p.m. but it stopped 5 hours ago. What is the correct time now?
(a)9.30 p.m.
(b)11 p.m.
(c)1 a.m.
(d)1.30 a.m.
Answer
Answer (as printed): C
Explanation
The watch loses $\frac{1}{2}$ hour each hour. So, it must have taken 8 hours to show 4 p.m. from 12 noon. Thus, it stopped at 8 p.m. So, the correct time is 5 hours ahead of 8 p.m., i.e., 1 a.m.
Explanation as extracted from the printed page; notation may be imperfect.