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  1. #1
    diamondcutter is offline Senior Member
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    at speeds of/at a speed of

    An elite sprinter can run at about 40 kilometers per hour, while the fastest dog, the greyhound can race at speeds of 60 kilometers per hour. Some horses can gallop at about 80 kilometers per hour, and antelopes can run close to 95 kilometers per hour.

    (Reading Tracks 2, International Language Teaching Services Ltd)

    In the 1st sentence, I wonder why the writer says “at speeds of 60 kilometers per hour” not “at a speed of 60 kilometers per hour”.

  2. #2
    PeterCW is offline Member
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    Re: at speeds of/at a speed of

    To a native speaker it doesn't feel unnatural but, as an editor, I would be inclined to "correct" it in the way that you suggest.
    Retired magazine editor and native British English speaker - not a teacher

  3. #3
    Tarheel's Avatar
    Tarheel is offline VIP Member
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    Re: at speeds of/at a speed of

    Quote Originally Posted by diamondcutter View Post
    An elite sprinter can run at about 40 kilometers per hour, while the fastest dog, the greyhound can race at speeds of 60 kilometers per hour. Some horses can gallop at about 80 kilometers per hour, and antelopes can run close to 95 kilometers per hour.

    (Reading Tracks 2, International Language Teaching Services Ltd)

    In the 1st sentence, I wonder why the writer says “at speeds of 60 kilometers per hour” not “at a speed of 60 kilometers per hour”.
    You can use your suggestion or delete speeds of.
    Not a professional teacher

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