23. 4 bells toll together at 9:00 am. They toll after 7, 8, 11 and 12 seconds respectively. How man

23. 4 bells toll together at 9:00 am. They toll after 7, 8, 11 and 12 seconds respectively. How many times will they toll together again in the next 3 hours?
a. 3 b. 4 c. 5 d. 6
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