Task: Question Answering
Input (English): Problem: a train 125 m long passes a man , running at 4 km / hr in the same direction in which the train is going , in 10 seconds . the speed of the train is : 
Options: a ) 49 km / hr , b ) 50 km / hr , c ) 45 km / hr , d ) 65 km / hr , e ) 87 km / hr
Output (English): a