A 1-km-long, 10-Mbps CSMA/CD LAN (not 802.3) has a propagation speed of 200 m/μsec. Repeaters are not allowed in this system. Data frames are 256 bits long, including 32 bits of header, checksum, and other overhead. The first-bit slot after a successful transmission is reserved for the receiver to capture the channel in order to send a 32-bit acknowledgment frame.
What is the effective data rate, excluding overhead, assuming that there are no collisions?