We want to send 1500 bytes through one switch ASB. The propagation delay on each link is 20 ms, and the bandwidth on each link is 10 bytes/ms. The ladder diagram shown shows the time to send the data as one big packet. Each bw delay is 1500 bytes / (10 bytes/ms) = 150 ms.

Suppose the data is now sent as three 500-byte packets. Give the total time to transmit all three packets to B, and also the time the first 500-byte packet arrives at B. The easiest way to do this is with a ladder diagram