Task: Question Answering
Input (English): Problem: two goods trains each 500 m long are running in opposite directions on parallel tracks . their speeds are 30 km / hr and 90 km / hr respectively . find the time taken by the slower train to pass the driver of the faster one ? 
Options: a ) 48 , b ) 30 , c ) 26 , d ) 23 , e ) 12
Output (English): b