Waiting for your answers... Answer the following work problem. Report your answer to the nearest tenth of a hour. Shawna can do a certain job in 7 hours. Mary can do the same job in 10 hours.If Shawna and Mary work together to complete the same job, how many hours will it take for them to complete it? hours

Shawna can do a certain job in 7 hours. Mary can do the same job in 10 hours.If Shawna and Mary work together to complete the same job, how many hours will it take for them to complete it?