Consider the figure below. Assume the three hosts $($A$,$ B$,$ and C$)$ start to transmit packets of $3000$ bytes at the same time towards Router B$.$ Suppose the link rate between the hosts and Router A is $4$Mbps$.$ The link rate between Router A and Router B is $1$Gbps$.$There are propagation delays in the links between the Hosts and Router A of $6,2,$ and $4$ms$.$ Router A and Router B have queuing delays of $12$ms and $7$ms respectively. Propagation delay between Router A and B is $6$ms$.$ What is the total nodal delay end$-$to$-$end?