Bird A starts flying from P to Q at 9 am, and Bird B starts flying from Q to P at 10 am. If B is 50% faster than A, what is the time at which they meet if P and Q are 300 km apart, and A's speed is 50 km/hr?
(a) 1 pm
(b) 2 pm
(c) 3 pm
(d) 4 pm