Task: Question Answering
Input (English): Problem: two trains of equal lengths take 12 sec and 24 sec respectively to cross a telegraph post . if the length of each train be 120 m , in what time will they cross other travelling in opposite direction ? 
Options: a ) 18 sec , b ) 12 sec , c ) 17 sec , d ) 21 sec , e ) 16 sec
Output (English): e