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The phrase "are how fast" is not correct and does not form a coherent expression in written English.
It may be intended to compare speeds or rates, but it lacks clarity and proper structure.
Example: "The speeds of the cars are how fast they can go on the highway."
Alternatives: "determine the speed" or "indicate how quickly".
Exact(17)
The only questions, he said, are how fast the extinctions were and whether hunting was the only cause.
The main questions driving this research are: How fast does the carbonation front move? and How long does it take until the front reaches the reinforcement?
But when it comes to pushing someone into frailty, he said, the real questions are, How fast is the muscle being lost, and how much remains?
Among the most momentous and enduring questions related to human-caused global warming are how fast and how high seas may rise.
Because they can send a flurry of text-messages explaining where they are, how fast they're moving and precisely when they'll arrive, down to the minute.
For those of us who are concerned about global warming, two of the most critical questions we ask are, "how fast is the Earth warming?" and "how much will it warm in the future?".
Similar(43)
"I personally took a track safety class recently, and then you really appreciate how dangerous it is — how big the trains are, how fast-moving they are, and how narrow the spaces are.
That's how fast it was".
The question is how fast.
That's how fast it moves.
That's how fast it changed hands.
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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