Question: A converts analog to digital at a = 59 Kbps Link transmission rate R = 4.2 Mbps Host A groups data into packets of length

A converts analog to digital at a = 59 Kbps Link transmission rate R = 4.2 Mbps Host A groups data into packets of length L = 116 bytes Distance to travel d = 871.8 km Propagation speed s = 2.5 x 108 m/s Host A sends each packet to Host B as soon as it gathers a whole packet. Host B converts back from digital to analog as soon as it receives a whole packet. How much time elapses from when the first bit starts to be created until the conversion back to analog begins? The answer is 19.44ms but I don't understand how they got this number.

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