Arunanshu Pandey, Nitesh Ratre and Rahul Mittal are running on a circular track of length 300m. Pandey and Ratre are moving in the same direction while Mittal is moving in the opposite direction. Speed of Pandey,Ratre and Mittal are 4m/s,6m/s and 10m/s respectively. After how much time will all the three meet at the same point for the first time.