Originally Posted by iqbal tahir

sir here please

a can do in 20 days
b can do in 25 days
lets suppose if will alone that work he will take 10days surely.. no one can deny


further, in real case with the help of B .. he will surely do his job which is more than 10 ...by the company of B he will surely take 11 days if he will be absent 5 days ... It will be more than 11 days ...