SSC CGL 2011 · Question 98 of 167

Three bells ring simultaneously at 11 a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three ring together next is

HCF and LCM

1. A2 p.m.
2. B1 p.m.Correct
3. C1.15 p.m.
4. D1.30 p.m.