Task: Question Answering
Input (English): Problem: 15 beavers , working together in a constant pace , can build a dam in 4 hours . how many hours will it take 20 beavers that work at the same pace , to build the same dam ? 
Options: a ) 2 . , b ) 4 . , c ) 5 . , d ) 6 , e ) 3 .
Output (English): e