UPSKILL MATH PLUS

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A circular road encloses a park. Jaya and Nanmugan are participated in the street competition to go round the park. Jaya takes 21 minutes to complete one circuit of the sector, while Nanmugan takes just 18 minutes. Assume they both begin at the same time and place and travel in the same direction. How long would take them to meet again at the starting point?
 
Jaya and Nanmugan meet at the starting point after ihoursiminutes.