Give me the Reason

A Boy Failed In exam. He Said 2 His Teacher: I'll ask U a Question. If u don't answer u'll have to give me A Grade"

Teacher: ok

Student: What's Legal But Not Logical, Logical But Not Legal & Neither Logical Nor Legal?

Teacher Couldn't Answer..He Gave Him A Grade
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Later the Student Answered:

Sir, U R 63 Yrs Old & Ur Wife Is 30. Thats Legal But Not Logical.
Your Wife Has a 25 Yrs Old Boyfriend, Its Logical But Not Legal.

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Now U Hav Given Ur Wive's Lover A Grade. Thats Niether Logical Nor Legal..:)