(1)He says he can read a book that thick in an hour, and I can't believe it.
(2)He says he can read a book that thick in an hour, but I can't believe it.
In what kind of context would (1)work better and in what kind would (2)work better?
Normal English here is but , because you are expressing a contradictory opinion. For and ,you'd need a context in which you want to very much avoid stressing the contradiction.
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Normal English here is but, because you are expressing a contradictory opinion.
For and,you'd need a context in which you want to very much avoid stressing the contradiction.