Task: Question Answering
Input (English): Problem: two goods trains each 500 m long are running in opposite directions on parallel tracks . their speeds are 42 km / hr and 30 km / hr respectively . find the time taken by the slower train to pass the driver of the faster one ? 
Options: a ) 22 , b ) 27 , c ) 50 , d ) 99 , e ) 12
Output (English): c