How long does it take for a packet of size $12KB$ to travel from source host $($S$)$ to

destination host $($D$)$ over three links $($connection$)$ connected by two routers $(S_1$ and

$S_2)$ as shown in Figure $1.$ Assume there are no other delays. Clearly derive the end$-$

to$-$end delay equation and show all the steps to calculate the end$-$to$-$end delay. Make

sure all the calculations and the end$-$to$-$end delay are in $\text{'}ms\text{'}$ and rounded off to three

decimal places. $(7$ Points$)$

Figure $1.$ Connection setup for three links.