Three traffic lights change after 36 seconds, 42 seconds and 72 second – McqOptions

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1.	Three traffic lights change after 36 seconds, 42 seconds and 72 seconds respectively. If they are switched on now, after how much time will they blink together ?
A.	8 min 24 sec
B.	8 min 4 sec
C.	8 min 44 sec
D.	8 min 54 sec
Answer» B. 8 min 4 sec

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