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Answer:It will take25.2 minutesto complete 21 laps.Explanation:Therate of covering 5 lapsis:Therefore, the time taken to cover 21 laps is:Hence, it will take25.2 minutesor25 minutes 12 secondsfor Lin to complete 21 laps.For more information, refer to the link:brainly.com/question/19638677?referrer=searchResults...