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 interpretations: (A) Equal interval between chimes. At 6 o’clock: 6 chimes yield 5 intervals = 10 s, so 1 interval = 2 s. At 10 o’clock: 9 intervals = 18 s. (Not an option.) (B) Equal time per chime. Time per chime = \(\frac{10}{6}\) s. For 10 chimes: \(\frac{10}{6}\times 10=16.\overline{6}\) s \(\approx 16.7\) s. Most exams use model (B), resulting in answer (c).