state gov Kolkata Police Constable Mock Test 2024 Quantitative Aptitude Number System LCM and HCF

Six sirens commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 40 minutes how many times do they toll together simultaneously?

1

21 times

2

22 times

3

23 times

4

20 times

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