Which SN1 reaction is faster?

Which reaction is faster and what is the kinetics of these reactions?
a) (CH3)3CCl ----> (CH3)3COH (in 70% water/methanol)
b) (CH3)3CCl ----> (CH3)3COH (in 50% water/acetone)

The faster reaction is shown and the kinetics are discussed.

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Solution Summary

This solution gives two SN1 reactions of t-butyl chloride. They are both nucleophilic displacements involving water, but one of them is faster.