This is the 2329th most frequent Dutch word.
snelste
"Fastest."
Here, 'snelste' is used as a comparative adjective in the superlative form to qualify the noun 'oplossing' (solution) as the one occurring in the shortest amount of time.
De snelste oplossing is vaak de beste.
The quickest solution is often the best.
In this sentence, 'snelste' refers to the superlative quality of the noun 'auto' (car), indicating it has the highest speed capability.
Hij rijdt in de snelste auto van het seizoen.
He drives the fastest car of the season.
Here, 'snelste' specifies the highest speed achieved among competitors, making it a quality description for the 'time' accomplished by the child.