Four bells begin to toll together and toll respectively at intervals o – McqOptions

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1.	Four bells begin to toll together and toll respectively at intervals of 6, 7, 8 and 9 seconds. In 1.54 hours, how many times do they toll together and in what interval (seconds)?
A.	4, 504
B.	4, 480
C.	2, 504
D.	6, 580
Answer» D. 6, 580

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