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3 bells beep at an interval of 12, 20, and 35 minutes. If they beep together at 10 a.m., then they will again beep together at:

A.	12 p.m.	B.	1 p.m.
C.	4 p.m.	D.	5 p.m

Answer and Explanation

Answer:5 p.m

Explanation:
The L.C.M. of 12, 20 and 35 is 420. Hence, all 3 bells beep together after 420 minutes = 7 hours
Hence, the 3 bells will beep together 7 hours after 10 a.m. i.e. at 5 p.m.

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