Question

A man can do a piece of work in 5 days what to do with the help of his son he can do it in 3 days in what time can the sun do it alone​

Answer 1

Answer:

His son alone can do it in 7.5 day

Answer 2

Step-by-step explanation:

$sons \: 1 \: day \: work = ( \frac{1}{3} - \frac{1}{5} ) = \frac{2}{15} \\ the \: son \: alone \: can \: do \: the \: work \: in \: \frac{15}{2} = 7.5 \: days$

7.5 days