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 learner". But in other expressions we don't use "fast" when somebody does something in
a short time: "Be fast! The bus in leaving!" We don't usually say "a quick car" or "don't drive so quickly". We can use "quick" and "fast" with words referring to change like: recovery, rate, rise and services: delivery, response, repair. We only use "quick" with words like: hug, kiss, bath and wash. We also use "quick" to talk about meals: breakfast, lunch, dinner,
etc.
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