Waiting for your answers... Answer the following work problem. Report your answer to the nearest tenth of a hour. Petra can do a certain job in 6 hours. Shawna can do the same job in 9 hours.If Petra and Shawna work together to complete the same job, how many hours will it take for them to complete it? hours

Petra can do a certain job in 6 hours. Shawna can do the same job in 9 hours.If Petra and Shawna work together to complete the same job, how many hours will it take for them to complete it?