Task: Question Answering
Input (English): Problem: excluding stoppages , the speed of a train is 45 kmph and including stoppages it is 30 kmph . of how many minutes does the train stop per hour ? 
Options: a ) a ) 5 , b ) b ) 10 , c ) c ) 20 , d ) d ) 30 , e ) e ) 40
Output (English): c