A) 10:45 a.m.
B) 10:15 a.m.
C) 12:00 p.m.
D) 11:00 a.m.
Correct Answer: D
Solution :
The L.C.M. of 40 and 60 will give the number of minutes after which the two bells will ring together again. Now, \[\therefore \] \[\text{224}=\text{12}0\times \text{1}+\text{1}0\text{4}\] \[\text{12}0=\text{1}0\text{4}\times \text{1}+\text{16}\]L. C. M. (40, 60) \[\text{1}0\text{4}=\text{16}\times \text{6}+\text{8}\] Hence, the two bells ring together again after 120 minutes i.e., after 2 hours i.e., at 11: 00 a.m.
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