Suppose there is exactly one p

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 the receiving host are R₁ and R_{2 ,}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 delay, and processing delay.)