What time should a train leave one terminal if the round trip time is 1 hour 20 minutes and it is scheduled to arrive at 9:10?

To determine the departure time for a train that has a round trip time of 1 hour and 20 minutes and is scheduled to arrive at 9:10, we need to work backwards from the arrival time.

First, convert the round trip time into minutes: 1 hour and 20 minutes equals 80 minutes.

Next, if the train is scheduled to arrive at 9:10, we subtract the total round trip time from this arrival time to find out when it should depart from the terminal.

Starting from 9:10:

• Subtract 80 minutes (which is 1 hour and 20 minutes).
• Subtracting 60 minutes (1 hour) brings us to 8:10.
• Then, subtracting the remaining 20 minutes takes us to 7:50.

The calculated departure time from the terminal is actually 7:50, which means the trip would start from that point and the train would return to the original terminal at 9:10.

However, if we consider the need for the train to depart at intervals throughout a schedule, choosing a more reasonable departure time that accommodates typical operational practices is important. Thus, if the only options available are those listed, departing at