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1 knot is equal to 1.15 mph

Mach 1, is about 760 mph at sea level. However, the speed of sound(Mach 1) varies at different altitudes (local speed of sound decreases with increasing altitude). At 36,000 feet the speed of sound is only 660 miles per hour because the temperature is lower.

Mach Speed at sea level is 660 knots and at 36,000 feet Mach Speed is 573 knots.

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10y ago

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