A packet of 10,000 bits is sent from node A to node B at a transmission rate of 100 Kbit/s across a distance of 100 km. Once the packet is completely received at B, it is sent back the other way around at the same transmission rate and across the same distance. You are to compute the time from the transmission of the first bit at A until the last bit is received back at A, assuming the signal travels at 200,000 km/s. Next, you need to repeat the calculation by considering the transmission rate to be 10 Gbit/s. ? B