Question

A man can do a piece of work in 5days. He and his son working together can finish it in 3 days. In how many days can the son do it alone?
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Answer 1

Answer:

7.5

Step-by-step explanation:

man = a , son . = b

A=5d and A+B=3d

B=?

we know that, time and work are inversely propertinal

i.e: A=2 days so A's work is 1/2

now , A=1/5 and A+B=1/3

use, A+B = A+B

1/5+1/x = 1/3

1/x = 2/15

2x = 15

x = 7.5