Task: Question Answering
Input (English): Problem: a and b walk around a circular track. they start at 8 a. m from the same point in the opposite directions. a and b walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. how many times shall they cross each other before 9 a. m
Options: a. 5, b. 6, c. 7, d. 8, e. 9
Output (English): a