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