Three bells roll at intervals of 9,12,15minutes respectively. If they start tolling together after what time will they next toll together.
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We need to find the LCM to find the common timing.
9=3x3
12=3x2x2
15=3x5
LCM = 3x2x2x5x3=180 min
SO they will roll again after 180 min.
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