I will answer, but in future if you want me to answer then you must ask in the F9 Ask the ACCA Tutor Forum – this forum is for students to help each other.
You were correct so far as PE = (D/Divi yield) / (D x Div cover) But then you went wrong.
If you divide top and bottom by D, then you get 1 / (Divi yield x Div cover) So PE = 1 / (0.09 x 3) = 3.70