Hosts A and B are connected to each other via switch S. S is a store-and-forward switch. The transmission rate from A to S and from S to B is 28 Mbps. Assume host A sends a 24 kB file to host B in one packet. (Assume k = 1000 and M = 106) Host A Switch S Host B a) [2] How long does it take the packet to arrive at Host B? b) [2] If the transmission rate from S to B is reduced to half of the transmission rate from A to S, how long will it take the packet to arrive at Host B?