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

Correct Answer: 7½ days

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