Question

In Vidyamandir school the duration of each period in the junior section is 40 minutes and in the senior section it is 35 minutes. Both bells ring together when school starts at 8.30 am. The next they ring together is at lunch time. at what time does lunch break start?

A) 12 Noon
B) 12:40
C) 12:30
D) 1:10

Answer 1

Answer:

12:30

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Step-by-step explanation:

Answer 2

since the first bell rings at the duration of 20 min and the other one after 35 minute the l.c.m of20 and 35 is 140 i.e 2 hours 20 min thus after 10:30 the next bells would be at 12:50 am and the next one at 3:10 pn