The packet transmission time is 10 microseconds for a packet

that is 600B and with a Bandwidth of 60Mb/s

The links in Packet Switching are shared unlike Circuit Switching

where the link is held for the duration of the connection

The packet transmission time is 72 microseconds for a packet

that is 180B and with a Bandwidth of 20Mb/s

The propagation delay to a satellite that is 35,786 Km above the

earth had a propagation delay of more than a tenth of a second

(given the speed of light being 299,792,458 meters/second) 

The aggregate of peaks is usually much smaller than peak of

aggregates in terms of bandwidth usage  

If the transmission rate is 80Mb/s and the propagation delay is 4

microseconds, the capacity of the link (Bandwidth Delay Product)

is 320 Bytes