Suppose a 10 Mbps network transmits 1024-byte packets containing a 128-byte header and a 4-byte checksum. If a workstation on the LAN is guaranteed to be able to transmit at least one packet every X time units (since the network is shared with other workstations), what maximum amount of time, as a function of X, should be required (based only on these factors) to transfer a 3MB file from a server to a workstation? What is the effective transfer rate from the server to the workstation?