"It's tried and true" vs "It's tried and fast"

[Mirko]

English Language Tests, Intermediate level

ESL/EFL Test #720 "Real Life: Common Word Pairs in North America (1)", question 10

No way! I'm never going to sell this car. I've had it for twenty years and I've never had one problem with it. It's tried and ......... and I'm keeping it.

(a) true
(b) fast
(c) tied
(d) thick

English Language Tests, Intermediate level

ESL/EFL Test #720 "Real Life: Common Word Pairs in North America (1)", answer 10

No way! I'm never going to sell this car. I've had it for twenty years and I've never had one problem with it. It's tried and true and I'm keeping it.

Correct answer: (a) true

Your answer was: incorrect
No way! I'm never going to sell this car. I've had it for twenty years and I've never had one problem with it. It's tried and fast and I'm keeping it.
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Why can't the answeer be fast car?

Mirko

[Dphvu]

Here you are http://www.english-test.net/forum/ftopic37120.html