iii will have slowest reaction (negligible) because during SN1 hydrolysis, Carbocation, if formed, will violate Bridt's rule, so iii will be least. For comparing i and ii: endo attack is prefered rather than exo attack (always), so i > ii.
Correct me if I’m wrong but from what i can remember it’s endo always for right ring and exo for left ring
See you can solve by options also there is no confusing option is given. we know that we cannot form bridge head carbocation so it will be at last.