Suppose two nodes, A and B$,$ are attached to opposite ends of an $800$ m cable, and that they each have one frame of $1500$ bits to send to each other. Assume that the signal propagation speed is $2108$ m$/$sec$.$ Both nodes attempt to transmit at time t $=0.$ Assume the transmission rate is $100$ Mbps$,$ and CSMA$/$CD with backoff intervals of multiples of $512$ bits is used. After the first collision, A draws K $=0$ and B draws K $=1$ in the exponential backoff protocol. b$.(5$ points$).$ At time t $=$ x$,$ both A and B detect a collision, and then abort. What is the value of x$?$