Task: Question Answering
Input (English): Problem: a train of 50 carriages , each of 60 meters length , when an engine also of 60 meters length is running at a speed of 60 kmph . in what time will the train cross a bridge 1.5 km long ? 
Options: a ) 6 , b ) 3 , c ) 4 , d ) 4.5 , e ) 2
Output (English): d