Task: Question Answering
Input (English): Problem: brenda and sally run in opposite direction on a circular track, starting at diametrically opposite points. they first meet after brenda has run 50 meters. they next meet after sally has run 150 meters past their first meeting point. each girl runs at a constant speed. what is the length of the track in meters ?
Options: a. 250, b. 300, c. 350, d. 400, e. 500
Output (English): a