Answer:
3.5 litres.
Explanation:
We can use the unit rate method to find how much tea Ben drinks per hour.
First, we can convert 2/3 of an hour to an hour by multiplying it by 3/2:
2/3 hour * 3/2 = 1 hour
This tells us that the rate of drinking tea is constant, and Ben drinks 3 and 1/2 liters of tea per hour.
Therefore, Ben drinks 3.5 liters of tea per hour.