Waiting for your answers... Answer the following work problem. Report your answer to the nearest tenth of a week. David can do a certain job in 7 weeks. Frank can do the same job in 9 weeks.David and Frank work together to complete the same job. However, David starts working 4 weeks after Frank starts to work. How many weeks will it take for them to complete the job once Frank starts to work? weeks
David can do a certain job in 7 weeks. Frank can do the same job in 9 weeks.David and Frank work together to complete the same job. However, David starts working 4 weeks after Frank starts to work. How many weeks will it take for them to complete the job once Frank starts to work?