A traffic light at a crossing changes after every 40 seconds.The traffic light at the next crossing changes after every 30 seconds.At a certain time both the lights change together. After how many minutes of their changing simultaneously will they change again at the same time
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the required answer is the L.C.M of 30 and 40
which is 120
Therefore,both the traffic ight would change after 1min20s
hope it helps
which is 120
Therefore,both the traffic ight would change after 1min20s
hope it helps
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