Task: Question Answering
Input (English): Problem: with both inlets open , a water tank will be filled with water in 36 minutes . the first inlet alone would fill the tank in 2 hours . if in every minutes the second inlet admits 50 cubic meters of water than the first , what is the capacity of the tank ? 
Options: a ) 9,000 , b ) 4,500 , c ) 1,750 , d ) 1,000 , e ) 2,000
Output (English): b