Three boys run around a circular ground. They can complete one circle in 20 sec, 30 sec, and 40 sec respectively . If they start from a point together , find out after what time they will be together again at the same piont . Also find out how many rounds each of them will have completed by that time.
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हधाए इ मेल के समक्ष पेश की दूरी को इंच तक का सबसे आसान हो तो हमें इस दौरान उन्होंने
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