P and Q start running in opposite directions (towards each other) on a circular track starting at diametrically opposite points. They first meet after P has run for 75m and then they next meet after Q has run 100 m after their first meeting. Assume that both of them are running a constant speed,then what is the length of the track (in metre) ?

• A. 350
• B. 70
• C. 175
• D. 250