Mathematics · LCM and HCF

चार धावकों ने एक वृत्ताकार ट्रैक पर एक बिंदु से एक साथ दौड़ना शुरू किया। उन्होंने एक चक्कर पूरा करने में क्रमशः 280 सेकंड, 350 सेकंड, 420 सेकंड और 560 सेकंड का समय लिया। कितने समय (सेकंड में) के बाद वे पहली बार शुरुआती बिंदु पर मिलेंगे?

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