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That depends upon the speed of sound through the medium in which the speed is being measured.

mach = speed ÷ speed_of_sound_there

⇒ speed = mach x speed_of_sound_there

In dry air at 20oC the speed of sound is [approx] 1236 km/h

⇒ speed_of_mach_0.85 = 0.85 x 1236 km/h

≈ 1051 km/h

At 11,000m (where the air temperature is about -50oC) the speed of sound is approx 86% of that in air at 20oC, that is about 1063 km/h

⇒ speed_of_mach_0.85 ≈ 0.85 x 1063 km/h

≈ 904 km/h

Q: How many kilometers per hour does 0.85 mach equal?

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About 90 Kilometers.

1225 x 0.82 = 1004.5 Km/h

63 miles per second = 365,000 kilometers per hour.

1294.04 miles per hour but it is dependent on temperature and atmospheric composition, Mach l is not a constant

55 kilometers an hour=34.1754156 miles per hour

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there are 13,475 kilometers per hour

Mach 2.34 is equal to 2445 KM/HR or 1548 MPH.

About 90 Kilometers.

mach 1 = 761.207 mph, so 761.207 * 0.791 = 602.115 mph

180 kilometers per hour = 111.846815 miles per hour

750*0.82=615 mph By the way, 1 mach is the speed of sound, which is 750 mph

20 km/h is 20 kilometers per hour.

1225 x 0.82 = 1004.5 Km/h

Mach 1 is 761.21 mph.Use this equation to convert Mach to miles per hour: mach x 761.21 = mph

63 miles per second = 365,000 kilometers per hour.

Mach 85 is 64,702.6 mph

Mach 1 = 761.207051 Miles Per Hour Mach 2 = 1,522.4141 Miles Per Hour Mach 3 = 2,283.62115 Miles Per Hour Mach 4 = 3,044.8282 Miles Per Hour http://en.wikipedia.org/wiki/Mach_number