Suppose there are exactly two packet switches between a sending host and a receiving host. The transmission rate between the sending host and...

Suppose there are exactly two packet switches between a sending host and areceiving host. The transmission rate between the sending host and switch#1 is R1. Thetransmissions rate between switch#1 and switch#2 and between switch#2 and thereceiving host are R2 and R3, respectively. Assuming that the switches user store-and forwardpacket switching, what is the total end-to-end delay to send a packet of length L?(Ignore queuing, propagation delay, and processing delay.)