A car travels a certain distance at 70 km/h and comes back at 30 km/h. Find the average speed for total journey.

A car travels a certain distance at 70 km/h and comes back at 30 km/h. Find the average speed for total journey.
1). 42 km/hr
2). 50 km/hr
3). 34 km/hr
4). 58 km/hr

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