Quick and fast.
Explanation of quick and fast.
We use "quick" when we talk about something that takes a short amount of time. "Fast" is usually used when we talk about things moving at high speed. This means that both words may be used when we say "he's quick/fast at doing something"; "a fast/quick worker"; "a fast/quick run"; "a fast/quick learner". But in other expressions we don't use "fast" when somebody does something in
a short time: "
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