A man can do a piece of work in 5 days, but with the help of his son, he can do it in 3 days. In what time can the son do it alone?

 A man can do a piece of work in 5 days, but with the help of his son, he can do it in 3 days. In what time can the son do it alone?

A). 7 ½ days

B). 5 ½ days

C). 9 ½ days

D). 3 ½ days

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