A certain amount of data is transmitted over the communication line in 10 seconds. Estimate how long it takes 10 times

A certain amount of data is transmitted over the communication line in 10 seconds. Estimate how long it takes 10 times more data to be transferred. Why, in practice, this time may differ from the calculated one?

t = 10s * 10 = 100s
In practice, the time may differ from the calculated one, because the transmission rate will not be constant.

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