Question

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 toe can the son do it alone
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Answer 1

Answer:

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Step-by-step explanation:

let, man=A and son=B

A=5d and A+B=3d

B=?

we now 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 1/2 or 7.5