Answer:
A 0.2 L water was filled into the bottle from faucet each seconds.
Explanation:
Unit rate is defined as the rates are expressed as a quantity of 1, such as 3 feet per second or 6 miles per hour, they are called unit rates.
Given the statement: A 2 liter bottle is filled completely with water from a faucet in 10 seconds.
⇒ In 10 sec a 2L bottle is completely filled with water from a faucet.
Unit rate per second =

Therefore, 0.2 L water was filled into the bottle each seconds.