The speeds of Rohit and Lalith are 30km/h and 40km/h. Initially, Lalith is at place X and Rohit is at place Y. The distance between X and Y is 650 kms . Rohit started his journey 3 hours earlier than Lalith to meet him. If they both meet each other at a place Z somewhere between X and Y and the distance between Y and Z is P , then what is the value of P÷2 ?​