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 ?
Choose the correct choice from the following answers:
A) 7 1/2days	B) 6 1/2days	C) 5 1/2days	D) 4 1/2days	E) 3 1/2days
Explanation:   In this type of question, where we have one person work and together work done. Then we can easily get the other person work just by subtracting them. 7 1/2dayss,   Son's one day work =   (1/3−1/5)=(5−3/15)=2/15   So son will do whole work in 15/2 days   which is =   7 1/2days   Option 7 1/2days
<result>A</result>
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 ?