Two trains start at the same time from P and Q and proceed towards Q and P respectively. P having a speed 25 km/hr and Q having a speed 75 km/hr. When they meet, it is found that one train has moved 120 km more than the other, What is the distance between P and Q ?
1
120 km
2
240 km
3
300 km
4
400 km
5
150 km