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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)?

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)? Correct Answer 12, 504

Interval after which the bells will toll together = (LCM of 6, 7, 8, 9) sec = 504 sec.
In 1.54 hours, they will toll together
$$\eqalign{ & {\text{ = }}\left \cr & {\text{ = 12 times}} \cr} $$

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