Waiting for your answers... Answer the following work problem. Report your answer to the nearest tenth of a day. Petra can do a certain job in 8 days. Mark can do the same job in 7 days.If Petra and Mark work together to complete the same job, how many days will it take for them to complete it? days

Petra can do a certain job in 8 days. Mark can do the same job in 7 days.If Petra and Mark work together to complete the same job, how many days will it take for them to complete it?