Total packet = 100000/1000 = 100.
Transmission time for 1 packet in all mode =
(1000/52 kbps) = 19.23 msec.
so , for 100th packet transmission delay = 19.23 * 100
. = 1923 msec.
now, as it is a 4 hop path, means, 3 switches are there..
So, total transmission delay in all nodes
= 19.23 * 3
= 57.69 msec.
Now, add 4 hop's propagation delay = 4 * 20 = 80 msec.
so, total duration = 1923 + 57.69 + 80 = 2060.69 msec
.