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Q.
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?
A.
4
B.
10
C.
15
D.
16
View Answer
Correct choice: D
Explanation:
L.C.M. of 2, 4, 6, 8, 10, 12 is 120. So, the bells will toll together after every 120 seconds(2 minutes). In 30 minutes,they will together (30/2)+1=16 times
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