Consider two routers, A and B$,$ connected by a single link with the rate of R bps$.$

Suppose that the two routers are separated by m meters, and suppose the propagation speed along the

link is s meters$/$sec$.$ Router A sends a packet with the size of L bits to router B$.$

a$)$ Ignoring processing and queuing delays, obtain an expression for the end$-$to$-$end delay.

b$)$ Suppose router A begins to transmit the packet at time t$=0.$ At time t$=$dtrans $($packet transmission

delay$),$ where is the last bit of the packet?

c$)$ Suppose dprop $($propagation delay$)$ is less than dtrans. At time t$=$dtrans, where is the first bit of the packet?