Task: Question Answering
Input (English): Problem: two trains of equal are running on parallel lines in the same direction at 46 km / hr and 36 km / hr . the faster train passes the slower train in 54 sec . the length of each train is ? 
Options: a ) 50 , b ) 26 , c ) 75 , d ) 28 , e ) 21
Output (English): c