Task: Question Answering
Input (English): Problem: two trains of equal are running on parallel lines in the same direction at 47 km / hr and 36 km / hr . the faster train passes the slower train in 36 sec . the length of each train is ? 
Options: a ) 50 , b ) 88 , c ) 66 , d ) 55 , e ) 22
Output (English): d