Q:

The traffic lights at three different road crossings change after 24 seconds, 36 seconds and 54 seconds respectively. If they all change simultaneously at 10 : 15 : 00 AM, then at what time will they again change simultaneously? 

• 1
  10:16:54 AM
• 2
  10:18:36 AM
• 3
  10:17:02 AM
• 4
  10:22:12 AM