Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively. In 30 minutes, how

Hello Varun, Correct option is D Since, LCM of 2,4,8,10 and 12 is 120. So, after each 120 seconds, they would toll together. Hence, in 30 minutes, they would toll (30×60)/120 =15 times But then the question says they commence tolling together. So, they basically also toll at the beginning. So, total tolls together =15+1=16 Hope this helps! See more