Task: Question Answering
Input (English): Problem: pipe a can fill a tank in 16 hrs and pipe b can fill it in 24 hrs . if both the pipes are opened in the empty tank . in how many hours will it be fill 5 / 4 th of that tank ? 
Options: a ) 10 , b ) 12 , c ) 14 , d ) 16 , e ) 18
Output (English): b