Answer:
t= 8.7*10⁻⁴ sec.
Explanation:
If the signal were able to traverse this distance at an infinite speed, the propagation delay would be zero.
As this is not possible, (the maximum speed of interactions in the universe is equal to the speed of light), there will be a finite propagation delay.
Assuming that the signal propagates at a constant speed, which is equal to 2.3*10⁸ m/s (due to the characteristics of the cable, it is not the same as if it were propagating in vaccum, at 3.0*10⁸ m/s), the time taken to the signal to traverse the 200 km, which is equal to the propagation delay, can be found applying the average velocity definition:

If we choose x₀ = 0 and t₀ =0, and replace v= 2.3*10⁸ m/s, and xf=2*10⁵ m, we can solve for t:

⇒ t = 8.7*10⁻⁴ sec.
True however it’s also depends on where you live but for this purpose it’s true
A symbol which should be used for entering a formula in a cell is: B. =.
<h3>What is Microsoft Excel?</h3>
Microsoft Excel can be defined as a software application that is designed and developed by Microsoft Inc., for analyzing and displaying spreadsheet documents by using rows and columns in a tabulated format.
<h3>What is a spreadsheet?</h3>
In Computer technology, a spreadsheet can be defined as a document which comprises cells that are arranged in a tabulated format with rows and columns. Also, a spreadsheet is typically used in various field to do the following on a data:
As a general rule, "B. =" is a symbol which should be used for entering a formula in a cell on a spreadsheet application such as Microsoft Excel.
Read more on spreadsheets here: brainly.com/question/4965119
#SPJ1