Directions: Read the following passage carefully and answer the question. Destinations A and B are 300 km apart from each other. Two persons P and Q start travelling towards each other from destinations A and B, respectively. They meet each other at a point O, which is 120 km away from destination A. Another person M starts travelling from destination A towards B. He has started his journey 1 hour after P started his journey. M meets Q 1.5 hours after he started his journey. If the speed of M is 20 km/hr faster than the speed of Q, at what speed should P travel so that he can meet Q and M at the same time?