Answer:
Ben will drink
liters of tea in one hour.
Step-by-step explanation:
Ben drinks
or
liters of tea in every
of an hour.
Here
of an hour can be represented in minutes as
minutes = 40 minutes.
Now we will apply unitary method to solve this question.
∵ Ben drinks amount of tea in 40 minutes =
liters
∴ Ben will drink tea in 1 minute = 
∴ Ben will drink the amount of tea in 60 minutes = 
= 
=
liters
=
liters
Therefore, in one hour Ben will drink
liters of tea.