The transmission distance between the sender and the receiver is 1000 km, and the propagation rate of the signal on the media is 2 * 10^8 m/s. Calculate the transmission delay and propagation delay for the following two cases:
(1) The data length is 10^7 bits and the data transmission rate is 100 kbit/s.
(2) The data length is 10^3 bits and the data transmission rate is 100 Gbit/s.
What conclusions can be drawn from the above calculation results?