This is the 339th most frequent Latvian word.
ātri
Quickly.
In this sentence, 'ātri' describes the manner in which the action of 'going to the store' is performed, specifying speed.
Es eju uz veikalu ātri.
I go to the store quickly.
Here, 'ātri' modifies the verb 'learns,' explaining the swiftness of how the learning is happening.
Viņš mācās ļoti ātri.
He learns very quickly.
In this context, 'ātri' relates to the speed of the car, indicating that it is moving faster than desired or expected.