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The phrase "a the speed of" is not correct in English.
It appears to be a typographical error, as it combines the indefinite article "a" with "the," which is unnecessary.
Example: "The car was moving at the speed of sound."
Alternatives: "at a speed of" or "at the rate of".
Similar(58)
At 26, Shenggy is something of a veteran in the speed-of-light world of Beijing's underground.
Multiplied together, wavelength and frequency equal a constant (the speed of light).
As a result, the speed of talks about the Islamic Republic's nuclear programme has increased.
The result runs at six hertz, about a millionth of the speed of a typical laptop computer.
"We had to figure out a balance between the speed of an exit and the return to taxpayers," he said.
It's a challenge to write and publish a book at the speed of the tech world.
There is a large gap between the speed of a workout and the speed of an N.F.L. game, and that is something players struggle with even after they have gone through a full training camp.
A fiery horse with the speed of light, a cloud of dust and a hearty Hi-Yo Silver!
"It's a question of the speed of the passage".
Just as there is a limit to the speed of sound waves in Earth's atmosphere, called "mach 1," there seemed to be a limit on the speed of field lines during the snapback, limiting the speed of reconnection.
"There was, however, a time when the speed of our favorite music was accelerating.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com