Task: Question Answering
Input (English): Problem: a computer factory produces 4200 computers per month at a constant rate , how many computers are built every 30 minutes assuming that there are 28 days in one month ? 
Options: a ) 2.25 , b ) 3.125 . , c ) 4.5 , d ) 5.225 , e ) 6.25
Output (English): b