The speed of sound gets lower as you go higher, because the air gets less dense. (For that matter, the speed of sound is much higher in water, since water is a lot more dense than air.) Off the top of my head, (and this is very rough and dimly-remembered), the speed of sound is about 760 mph (about 1223 kmh) at sea level, but falls to about 666 mph (about 1072 kmh) at 20,000 feet (about 6096 meters) above sea level.
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