Learn about new technologies! # 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 ?

$4\frac{1}{2}days$

$5\frac{1}{2}days$

$6\frac{1}{2}days$

$7\frac{1}{2}days$