Question

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 8 a.m., at what time will they change together again? *

8 : 7 : 12 a.m.
8 : 5 : 10 a.m.
8 : 7 : 10 a.m.
8 : 12 : 15 a.m.

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Answer 1

Answer:

We know that in order to find the time when the three lights will change simultaneously again after 7 a.m., we need to find the LCM of 48, 72, and 108. Hence, after converting 432 seconds into minutes and seconds, we get: 432 seconds = 7 minutes and 12 seconds.

Step-by-step explanation:

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