Question 1: An image is 1024 x 768 pixels with 3 bytes required to store data of every pixel. Assume the image is uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over a 1-Mbps cable modem? Over a 10-Mbps Ethernet? Over 100-Mbps Ethernet?

Question 2: For the previous problem, If the file is sent using a binary signal over a 3-kHz channel whose signal-to-noise ratio is 20 dB, what is the maximum achievable data rate? How long it will take? How about when the channel is noise-free?