4 bells begin tolling together at the intervals of 20, 25, 30 and 40 s – McqOptions

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1.	4 bells begin tolling together at the intervals of 20, 25, 30 and 40 seconds respectively. How many times do they toll together in an hour?
A.	5
B.	7
C.	6
D.	4
Answer» C. 6

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