Question

4. 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?​

Answer 1

Answer:

15/2 days or 7.5 days

Step-by-step explanation:

One day work of man

1/x = 1/5

On day work of man and son

1/x + 1/y = 1/3

So one day work of boy will be

1/y = 1/3 - 1/5

1/y = 2/15

So boy can complete work in

y = 15/2

y= 7.5 days