Three bells ring at intervals of 36 seconds, 40 seconds and 48 seconds, respectively. They start ringing together at a particular time. When they will ring together again?  Pick:
A) After 6 minutes  B) After 12 minutes  C) After 18 minutes  D) After 24 minutes  E) none
LCM of 36,40,48 is 720   720/60= 
<gadget id="calculator">720/60</gadget>
<output>12</output>
12   ANSWER:After 12 minutes
<result>B</result>
Three bells ring at intervals of 36 seconds, 40 seconds and 48 seconds, respectively. They start ringing together at a particular time. When they will ring together again?