In a school two bells commence tolling together and toll at interval of 30 min and 45 min respectively. If both bells toll together at 7.00a.m. then after how many minutes they toll together and at what time ?
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Step-by-step explanation:
after 90 min they will toll together at 8:30 a.m.
l.c.m of 45 and 30 is 90
so, after 90 minutes