Task: Question Answering
Input (English): Problem: a train crosses a bridge of length 150 m in 7.5 seconds and a lamp post on the bridge in 2.5 seconds . what is the length of the train in metres ? 
Options: a ) 37.5 m , b ) 75 m , c ) 25 m , d ) 80 m , e ) 30 m
Output (English): b