"Four bells begin to toll together and toll respectively at intervals of 6, 7, 8 and 9 seconds.
Channel: Doubtnut
Date: 2020-04-05

"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) 14,
 504 (b) 14, 480 (c) 12, 504 (d) 16, 580"