Crossword puzzle clue "number speed ratio"

Here are the possible solutions for number speed ratio clue

Answer
Clue
Relevancy
mach
Clue
Speed-ratio number
Sound-speed ratio number
-- number (speed ratio)
___ number (speed ratio)
Speed-of-sound ratio
Speed ratio
Speed of sound ratio
Flying speed ratio
Definition
a number relating the speed of a body to the speed of sound

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