What is the round trip time between two terminals, not including layover time?

The round trip time between two terminals is typically determined by the time taken to travel from the starting terminal to the destination terminal and back, without accounting for any waiting or layover periods. In this case, the choice of 1 hour as the answer suggests that the combined travel time for the outbound and return journey is efficiently calculated based on various factors, such as average speed, distance between the terminals, and any operational delays that might be minimal.

Considering operational efficiencies, a round trip of 1 hour could imply that each leg of the journey takes approximately 30 minutes, which aligns with common timeframes for regional train services. This answer reflects various factors of scheduling and travel time averages that are standard for train operations. The other choices suggest longer travel durations that are less likely to be typical for a round trip under normal operational conditions, making 1 hour the most plausible and accurate answer in this scenario.