Task: Question Answering
Input (English): Problem: a cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.2 m and its walls are 5 cm thick. the thickness of the bottom is :
Options: a. 90 cm, b. 2 dm, c. 1 m, d. 1.1 cm, e. none of these
Output (English): b