Task: Question Answering
Input (English): Problem: running at the same constant rate , 5 identical machines can produce a total of 270 bottles per minute . at this rate , how many bottles could 10 such machines produce in 4 minutes ? 
Options: a ) 648 , b ) 1,800 , c ) 2,160 , d ) 10,800 , e ) 64,800
Output (English): c