Question $11$Queues $24$T$0$

Suppose four packets arrive simultaneously to a link at which no packets are currently being transmitted or queued. Each packet has a length of $600$ bytes and the output link has a transmission rate of $1\mathrm{.}54$Mbps$.$

What is the average queuing delay for the four packets? Please provide a concise explanation of how you arrived at this result in two to three sentences. $(1$ mark$)$