It depends on how long (time) you are travelling at 20 kilometres per second.
Distance = speed x time
Say you travelled for 10 seconds then your distance travelled will be 200 km.
Every one minute (60 seconds) you will travel 1200 km.
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Approximately 66.4 hours
The speed of sound in air is approximately 343 meters per second. To convert this to kilometers per minute, we need to multiply by 60 seconds (1 minute). Therefore, the sound would travel 20,580 meters in 1 minute, which is equivalent to 20.58 kilometers.
9.5333 feet
about 6 hours and 40 minutes
In order to calculate how many minutes it would take someone to travel 5 kilometers you need to know the speed the person is traveling at. For example if the person is traveling at a speed of 60 kilometers an hour it would take them 5 minutes to travel 5 kilometers.