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Playing With Numbers

Question 6:

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m., at what time will they change simultaneously again?

Answer:

Time period after which these lights will change = LCM of 48, 72, 108

2

48, 72, 108

2

24, 36, 54

2

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