ANSWERS: 2

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.

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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