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 6.5 days
B 7 days
C 7.5 days
D 8 days

Correct Answer: 7.5 days

Man can do in 1 days = 1/5 portion Man + son can do in 1 days = 1/3 portion Man can do alone in 1 days = ( 1/3 - 1/5) portion = 2/15 portion 2/15 portion can be done in 1 days 1 (hole) can be done in = 15/2 days = 7.5 days
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