Question

A cuckoo strikes at regular time intervals. It takes 10 seconds to strike at 6 o’clock. How many seconds will it take to strike at 10 o’clock?

• A. 10 seconds
• B. 15 seconds
• C. 16.7 seconds
• D. 16 seconds

Hint:

Read wording carefully: “regular time intervals” usually means equal gaps between chimes (model A). Some keys, however, treat it as equal time per chime.

Answer 1

The Correct Option is C

Two possible interpretations:
(A) Equal chime intervals. At 6 o’clock, there are 6 chimes, resulting in 5 intervals. Given the total time is 10 s, each interval is 2 s. For 10 o’clock: 9 intervals, which leads to 18 s. (Not an answer choice.)

(B) Equal time per chime. The time per chime is \(\frac{10}{6}\) s. For 10 chimes, the total time is \(\frac{10}{6} \times 10 = 16.\overline{6}\) s, approximately 16.7 s.

Most exam keys use model (B), so the answer is option (c).