Task: Question Answering
Input (English): Problem: a flagpole 18 meters high casts a shadow of length 45 meters . if a building under similar conditions casts a shadow of length 60 meters , what is the height of the building ( in meters ) ? 
Options: a ) 20 , b ) 24 , c ) 28 , d ) 32 , e ) 36
Output (English): b