Task: Question Answering
Input (English): Problem: two trains are moving in opposite directions with speed of 70 km / hr and 90 km / hr respectively . their lengths are 1.10 km and 0.9 km respectively . the slower train cross the faster train in - - - seconds 
Options: a ) 56 , b ) 45 , c ) 47 , d ) 26 , e ) 25
Output (English): b