11. Train A starts at 6 a.m. from city P towards city Q at a speed of 54 kmph. Another train B' starts at Sam. from P towards Q at 72 kmph. If the distance between P and Q is 1440 km, find at what distance from I would the two trains meet each other? (1) 792 km (2) 648 km (3) 954 km 4) 486 km