4 bells toll together at 9 p.m. They toll after 7, 8, 11 and 12 seconds respectively. how many times will they toll together again in the next three hours?
A)3
B)4
C)5
D)6
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After every 1848 secs they will toll together. So, The sequence will be 9:00 AM , 9:31 AM , 10 : 02 AM , 10:33 AM, 11:04 AM , 11: 35 AM… Thus, in the 3 hours, the bells will toll together 5 times.
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