Difference between "tired" and "fed up"

[Lemour]

Business English Lesson, Advanced Level

ESL/EFL Test #94 "Corporate Policy (2)", question 1

She is ......... with having to do 2 people's jobs.

(a) tired
(b) tiring
(c) feel down
(d) fed up

Business English Lesson, Advanced Level

ESL/EFL Test #94 "Corporate Policy (2)", answer 1

She is fed up with having to do 2 people's jobs.

Correct answer: (d) fed up

Your answer was: incorrect
She is tired with having to do 2 people's jobs.
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could u explain the difference between "tired" and "fed up"?

Lemour

[Mordant]

"Tired" will not occur with "with." The use of "with" was your clue to choose "fed up."

"Tired" and "fed up" can both convey exasperation from experiencing too much of some behavior, but the latter is stronger. Also, whereas "tired" can mean physically exhausted, "fed up" always describes your emotional response to something.

I ran 5 miles today, so I'm tired.
*I ran 5 miles today, so I'm fed up.
He won't stop nagging me. I'm tired of him.
He won't stop nagging me. I'm fed up with him.