Task: Question Answering
Input (English): Problem: two cyclist start on a circular track from a given point but in opposite direction with speeds of 7 m / s and 8 m / s. if the circumference of the circle is 630 meters, after what time will they meet at the starting point ?
Options: a. 20 sec, b. 15 sec, c. 42 sec, d. 50 sec, e. 1 min
Output (English): c