Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and receiving host are R1 and R2 respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L? (Ignore queuing, propagation, and processing delay) extend to N-1 packet switches interconnected by N links with rates R1, R2, , RN