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I'm trying to make a tagline for my website, can I say "download files at super fast speeds"? Is this grammatically correct?

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3 Answers 3

up vote 2 down vote accepted

Yes.

Many speeds are recorded at (plus something)

"The Hong Kong Observatory put the storm's maximum ten-minute sustained winds at 260 km/h (160 mph) prior to landfall in the central ". (Wiki)

"She types at (a speed of) 56 words per minute."

A child's vocabulary grows at an average rate of (however many words per year depending on age.)

I won't go into 'at vs of', I will just say that for your purpose, your word choice is fine.

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Thanks Susan, this a great explanation. Thanks once again. :) –  Naveen Gamage Dec 9 '13 at 0:27

Yes, you can say it, and it is idiomatic (though I would write superfast as one word).

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Another use of 'at speed' might be:

The crash happened at speed.

meaning the crash happened while (the car) was travelling at a significant speed. i.e. not while stationary or when maneuvering.

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