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 R$1$ and R$2,$ respectively. Assuming that the switch uses store$-$andforward packet switching, what is the total end$-$to$-$end delay to send a packet of length L$?($Ignore queuing, propagation delay, and processing delay.$)$

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