Question

A clock is set correct at 1 p.m. It loses 20 minutes every 24 hours. Find the actual time when the clock shows 12 noon on the $4^{th}$ day.

• A. 12 noon
• B. 11 a.m.
• C. 1 p.m.
• D. 2 p.m.

Answer 1

The correct option is C 1 p.m.

The clock is set correct on the 1st day. In the next 3 days, the clock loses
20 x 3 = 60 minutes.

We are also given, the time on the clock on the 4th day is 12 noon.

At 12 noon, the actual time = 12 noon + 1 hour = 1 p.m.

Hence, exactly 72 hours passed and therefore, the actual time is 1 p.m.