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It takes 4 seconds for a clock to ring its bells at 4 o' clock. How much time it will take to ring its bells at 8 o'clock?
1. \(9{1 \over 3}\) seconds
2. \(9{2 \over 3}\) seconds
3. 12 seconds 
4. 6 seconds

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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

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