Task: Question Answering
Input (English): Problem: two trains move in the same direction at speeds 50 kmph and 32 kmph respectively . a man in the slower train observes that 15 seconds elapse before the faster train completely passes by him . what is the length of faster train ? 
Options: a ) 100 m , b ) 75 m , c ) 120 m , d ) 50 m , e ) 70 m
Output (English): b