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並前往https://www.hackmath.net/en/calculator/conversion-of-speed-units?unit1=ft%2Fh&unit2=mm%2Fs&dir=1

Conversion feet per hour to milimeters per second, ft/h to mm/s.

In other words, the value in ft/h divide by 11.81102364 to get a value in mm/s. The calculator gives the answer to the questions: 30 ft/h is how many mm/s?

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