CLAT 2020 Question Paper with answer key for online practice

Since someone is suggesting to another person that if he wants to reach Delhi from Chennai at the earliest then go by Aeroplane, which implies that both the cities are connected via Air transport. Thus, assumption I is implicit. Also, statement clearly states that person reaches quickly by Aeroplane which implies that it takes less time to travel and which means that air distance between these two cities is less. So, assumption III is also implicit.
The word 'quickly' indicates that Aeroplane is the fastest mode of transport, not the only means of transport between the two cities. Thus, assumption II is not implicit.
Hence, assumption I and III are implicit.