Three bells ring at intervals of 15, 20 and 30 minutes respe

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Three bells ring at intervals of 15, 20 and 30 minutes respectively. If they all ring at 11.00 a.m. together, at what lime will ' they next ring together?

[RRB NTPC 28 March 2016 Shift 1]

A 11.30 a.m.

B 12 noon

C 12.30 p.m.

D 1.00 p.m