SSC IB ACIO Grade II Mock Test 2023 Quantitative Aptitude Number System LCM and HCF

Five bells commence tolling together and toll at intervals of 5, 10, 15, 20 and 25 seconds respectively. In 1 hour 20 minutes, how many times do they toll together?  

1
20 times 
2
15 times 
3
14 times 
4
17 times 
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