Task: Question Answering
Input (English): Problem: two trains of length 100 m and 200 m are 100 m apart. they start moving towards each other on parallel tracks, at speeds 36 kmph and 72 kmph. in how much time will the trains cross each other ?
Options: a. 40 / 6, b. 40 / 3, c. 40 / 9, d. 40 / 2, e. 40 / 1
Output (English): b