A $64-$kilobyte message is to be transmitted from the source to the destination as

shown below. Each link limits packets to a maximum size of $2-$kilobytes, and each

packet has a $32-$byte header. How long does it take to transmit the message from

the source to the destination? Assume that the signal propagates at a speed of $2$x$105$

km$/$s$,$ and tack and tproc are both negligible.