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?<br><br>

1. 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?

[BB Assistant Director-2014 : 2014]

1. 6.5 days

2. 7 days

3. 7.5 days

4. 8 days

Answer

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