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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?
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- 10 : 16 : 54 AM
- 10 : 18 : 36 AM
- 10 : 17 : 02 AM
- 10 : 22 : 12 AM
Correct Option: B
LCM of 24, 36 and 54 seconds = 216 seconds = 3 minutes 36 seconds
∴ Required time = 10 : 15 : 00 +
3 minutes 36 seconds
Hence , Required time = 10 : 18 : 36 a.m.
