What is the maximum time and the minimum time it takes for communication from the space shuttle to reach the Director of NASA who is seated 20 meters away from the communication radio at Mission Control at the Johnson Space Center in Houston, Texas. You may assume that room temperature at the Center is 20 C.
I don't know the equation I should start from
The Attempt at a Solution
If somebody could give me at least a hint how should I start, it will be great.