ANSWERS: 2
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Using an equation I found on the Internet and assuming a temperature of -70 degrees Celcius, I calculated the speed of sound to be approximately 647 mph. However, I assume that's for sea level. I'm still interested in the speed of sound at an altitude of 44,000 feet.
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it is 574.5knots or 661 miles per hour as the temperature of atmosphere after 39000 ft remains constant to a value of -56 degree celsius
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