ETA: Estimated Time of Arrival
ETA Full Form
The ETA indicates the expected arrival time. Also called “expected arrival time”. ETA is now one of the most common traditional languages on the Internet every day.ETA Full Form

It is used or can be used to anticipate the arrival of a particular entity or the rest of the time. This entity can be a train, a plane, a bus, a plane, a message, or a carrier, anything you expect to come. The term is usually used to indicate the date on which the ship is to arrive at the port. Time is determined by the expected time in hours and minutes in the case of a particular date.ETA Full Form
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The estimated time of past experiences is measured using a formula. For example, on public transport, the estimated arrival time of trains, buses, planes, etc. is based on its scheduled schedule, traffic density, and current and past records of the current movement.
Example
Suppose you pass by train from Delhi to Agra. the space between Delhi and Agra is 180 km and therefore the average speed of the train is 60 km per hour. So if your journey starts at 6 am, the estimated time to succeed in Agra (ETA) is going to be 9 am.