Question

If 2 men or 3 boys take 40 hrs to do a certain piece of work ,how long will 4 men and 9 boys working together take to complete the work?

Answer 1

Step-by-step explanation:

2 men taking time to do a certain work = 40 hr

4 men take time to do a  certain work = 20 hr

3 boys taking time to do a certain work = 40 hr

9 boys taking time to do a certain work = 13.3 hra