A train goes from city P to city Q at a speed of 50 km/h and returns from city Q to city P at a speed of 70 km/h. The total distance covered in both sides is 700 km. find the average speed of the journey in km/hr.
1
55.55 km/hr
2
58.33 km/hr
3
41.95 km/hr
4
50.33 km/hr
5
60.75 km/hr