Task: Question Answering
Input (English): Problem: a 210 m long train running at the speed of 120 km / hr crosses another train running in opposite direction at the speed of 80 km / hr in 9 sec . what is the length of the other train ? 
Options: a ) 290 , b ) 280 , c ) 270 , d ) 260 , e ) 250
Output (English): a