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I understand that pace and speed are often interchangeable, however, why are they not in this case? Only the latter is correct according to the answer key.

The lifeguards were on a training exercise in the sea when the dolphins swam towards them at considerable speed, then circled them repeatedly, hitting the surface of the water with their fins.

Here are the Cambridge definitions: pace speed

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  • All I can say is "the answer key" is just someone's opinion - with which I disagree. Perhaps the test setter is a bit literal-minded, and thinks that since dolphins don't have legs, they can't move at a pace. In which case I'd just offer The kid got into his ambulance and drove away at a fair pace. May 2, 2018 at 13:43
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    "a considerable pace" would seem more natural to me (BrE). That might be the deciding factor? May 2, 2018 at 13:45

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