The photocopying rates of two machines D and E are as shown. Both machines were use to make a copy of a set of notes which had been divided into teacher set and student set. Machine D took 7 minutes is to photocopy teacher set and Machine E took 9 minutes to photocopy student set.
- How many pages were there altogether in the set of notes?
- Another copy of the same set of notes was made using Machine E only. How many minutes did Machine E take?