Task: Question Answering
Input (English): Problem: water is leaking out from a cylinder container at the rate of 0.31 m ^ 3 per minute . after 10 minutes , the water level decreases 1 / 9 meters . what is value of the radius in meters ? 
Options: a ) 2 , b ) 3 , c ) 4 , d ) 6 , e ) 9
Output (English): b