Task: Question Answering
Input (English): Problem: two goods trains each 500 m long are running in opposite directions on parallel tracks . their speeds are 45 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 sec , b ) 88 sec , c ) 48 sec , d ) 18 sec , e ) 9 sec
Output (English): c