Answer :
Step-by-step explanation:
1)
S = {1<=x<=10}
where x = the recycle time.
2)
E1 = {1.5<=x<=5}
3)
E2 = {2<=x<=8}
4)
E1 U E2 = {1.5<=x<=8}
5)
E1 and E2 = {2<=x<=5}
6)
E1' = {1<=x<1.5} U {5<x<=10}
7)
E2' = {1<=x<2} U {8<x<=10}
Thus,
E1 U E2' = {1<=x<5} U {8<x<=10} [ANSWER]