Five bells begin to toll together and toll respectively at intervals of 6, 7, 8, 9 and 12 seconds. After how many seconds will they toll together again ?
72 Sec.
612 Sec.
504 Sec.
318 Sec.
Correct Option: C
Required time = LCM of 6, 7, 8, 9 and 12 seconds = 504 seconds
