Traffic lights at three different road crossings change after every 48

1.	Traffic lights at three different road crossings change after every 48 sec, 72 sec and 108 sec respectively. If they all change simultaneously at 7 : 00 : 00 hours then at what time will they again change simultaneously? (A) 7 : 14 : 00 Hrs (B) 7 : 14 : 12 Hrs (C) 7 : 07 : 12 Hrs (D) 7 : 09 : 12 Hrs
Answer» (C) 7 : 07 : 12 Hrs The LCM of 48, 72, 108 is 432, so they strike again in 432 sec = 7 min 12 sec.

Traffic lights at three different road crossings change after every 48 sec, 72 sec and 108 sec respectively. If they all change simultaneously at 7 : 00 : 00 hours then at what time will they again change simultaneously? (A) 7 : 14 : 00 Hrs (B) 7 : 14 : 12 Hrs (C) 7 : 07 : 12 Hrs (D) 7 : 09 : 12 Hrs

Answer»

(C) 7 : 07 : 12 Hrs

The LCM of 48, 72, 108 is 432, so they strike again in 432 sec = 7 min 12 sec.

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