Task: Question Answering
Input (English): Problem: two trains from opposite directions are to cross each other . the length of two trains are 100 meter and 200 meter respectively . the speed of first train is 100 km / hour and second train 200 km / hour . in how much time will they cross each other ? 
Options: a ) 2 second , b ) 3.6 second , c ) 5 second , d ) 5.5 second , e ) 6 second
Output (English): b