Question

Which communication is very slow

Answer 1

Answer:

Telephone is the slowest means of communication.

Answer 2

Answer:

The slowest digital communication I have used is phoning home and letting it ring once for “I will get on the next train”, twice for “I am at the main station” and three times for “I am at the branch station” to communicate when and where for wife to pick me up. (effective baud rate below 1 baud, but free)

Physical communication (by post or truck) has high latency, but the “packet size” can be very large! So if you are sending a book, use the Internet (physical mail is “slow” at this size), but if you are sending closer to 100PB, use one of these trucks (the Internet is “slow” at this size):