Task: Question Answering
Input (English): Problem: a man is standing on a railway bridge which is 180 m long . he finds that a train crosses the bridge in 20 seconds but himself in 8 seconds . find the length of the train and its speed . 
Options: a ) 10 m / sec , b ) 15 m / sec , c ) 18 m / sec , d ) 19 m / sec , e ) 25 m / sec
Output (English): b