Question

in vidyamandir school, the duration of each period in the junior section is 20 minutes and in the senior section it is 35 minutes. both bells ring together when school starts at 10:30 am. the next time they ring together is at lunch time. at what time does lunch break start? (with solution)



A. 12:50 pm
B. 12 noon
C. 11:40 am
D. 12:30 am

Answer 1

d is. the answer for the above question

Answer 2

since the first bell rings at the duration of 20 min and the other one after 35 min the l.c.m of 20 and 35 is 140 min i.e 2 hour 20 min thus after 10.30 the next bell would be at 12 .50 am and the next one at 3.10 pm