What is the answer to "Supersonic speed number" in the NYT Crossword?

The answer to the NYT Crossword clue "Supersonic speed number" is MACH (4 letters).

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NYT

Supersonic speed number NYT Crossword Clue

Across clue · from the January 6, 2025 puzzle

Stuck on “Supersonic speed number” from the New York Times Crossword? Here is the verified answer:

Answer

MACH

4 letters · Across · last seen January 6, 2025