Task: Question Answering
Input (English): Problem: two trains of equal length , running with the speeds of 60 and 40 kmph , take 50 seconds to cross each other while they are running in the same direction . what time will they take to cross each other if they are running in opposite directions ? 
Options: a ) 10 sec , b ) 11 sec , c ) 77 sec , d ) 99 sec , e ) 67 sec
Output (English): a