Question

Debashis can do a job in 8 days, and his son do it in 12 days. How long would it take them to do the job if they worked togather?

Answer 1

hope the answer is correct

Answer 2

let debashis do work in 1 day=1/8

his son do work in 1 day=1/12

 together do same work=1/8+1/12
                                             =(3+2)/24
                                            =5/24

24/5 days is answer.
 24/5 days long would it take them to do the job if they worked togather.

i hope its help you..