Question

The traffic light at three different road crossing change after every 24 seconds, 36 seconds, and 72 seconds respectively. If they change simultaneously at 9 p.m. at what time will they change simultaneously again?​

Answer 1

Answer:

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Answer 2

Answer:

For this we would find the LCM of there three figures.

LCM by long division method - 72

First the traffic lights changed at 9 pm then now after 72 sec all the three traffic lights will change at the same time i.e - at 9:01:12 pm