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Four bells ring at the intervals of 5, 6, 8, and 9 seconds respectively. All the bells ring simultaneously at some time. They will again ring simultaneously after:
1. 12 minutes
2. 6 minutes
3. 24 minutes
4. 18 minutes

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Correct Answer - Option 2 : 6 minutes

Calculation:

L.C.M. of 5, 6, 8 and 9

⇒ 5 = 5 × 1

⇒ 6 = 3 × 2 × 1

⇒ 8 = 2 × 2 × 2 × 1

⇒ 9 = 3 × 3 × 1

L.C.M. = 2 × 2 × 2 × 3 × 3 × 5

L.C.M. = 360

⇒ 360 seconds = 6 minutes

 ∴They will again ring simultaneously after 6 minutes

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