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How many seconds does it take to get 1000000 math books up?
If it takes 3s to get a math book, and only one person can do it, then it takes 3 million seconds for 6,543.8+0,000 math books.

If there are 10 people working together at the same time, it only needs 3000000÷ 10=300000 (seconds) =30 (ten thousand seconds).