Task: Question Answering
Input (English): Problem: the edges of three metal cubes are 1 cm , 2 cm , and 4 cm respectively . a new cube is made by melting these three cubes together . what is the edge of the new cube ( in centimeters ) ? 
Options: a ) 3.8 , b ) 4.2 , c ) 4.6 , d ) 5.0 , e ) 5.4
Output (English): b