Correct Answer - Option 1 :

\(9{1 \over 3}\) seconds

**Given:**

It takes 4 seconds for a clock to ring its bells at 4 o'clock.

**Concept Used:**

To ring 'n' bells interval is (n - 1) times

**Calculation:**

To ring 4 bells time interval is 3

To ring 8 bells time interval is 7

⇒ For 3 interval time required 4 seconds

⇒ for 1 interval time required 4/3 seconds

⇒ for 7 interval time required (4 × 7)/3 = 28/3 seconds = \(9{1 \over 3}\) seconds

**∴ It will take \(9{1 \over 3}\) seconds to ring its bell in 8 o'clock**