This is the 2064th most frequent Polish word.
metra
"Metra" in Polish is the plural form of "metr," meaning "meters" (units of length).
In this sentence, 'metra' is used as the genitive case of 'meter' (metr), showing a plural form (meters) in Polish.
Mogę przejść pięć metrów w minutę.
I can walk five meters in a minute.
Here, 'metra' appears as part of an associative phrase indicating distance in genitive plural due to the respective numeral syntax requirements.
Sklep jest położony około stu metrów stąd.
The shop is located about one hundred meters from here.
In this usage, 'metra' reflects measurement units in genitive plural due to the related numeral conformity in Polish.