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1. Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
- A. 4
- B. 4
- C. 4
- D. 4
Answer: Option C
Explanation:
The L.C.M of 2, 4, 6, 8, 10, 12 = 120
So, after 120 seconds later they toll together.
Now,
At 120 seconds toll it 1 times
At 1 seconds toll it 1/120 times
At 1800 seconds toll it ( 1800/120) = 15 times
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