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Researchers put a price(定价) on each chore,then tried to find

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Researchers put a price(定价) on each chore,then tried to find out how long the average person ta
Researchers put a price on each chore,then tried to find out how long the average person takes doing them.
这句话怎么理解?为什么average person前面的冠词是the而不是a?
还有为什么takes doing them?take后面加的为什么是doing?
研究人员对每项工作都进行了定价,想要知道一般人花费多少时间来做它们(指工作).
the在这里表特指,如果换成a应该也是可以的
后面是一个句型:sb.takes sometime doing sth
你将它改为特殊疑问句,以How long开头,便是:How long does sb. take doing sth?
因为该句子做宾语从句,所以必须用陈述语序,便是:How long sb. takes doing sth