Quantitative Aptitude Speed Time and Distance Average Speed

A teacher goes to school at 20% of the speed at which he returns from school. If the average speed during the whole journey is 12 km/hr, then what is the speed of the teacher while he was going to school?

1

9.2 km/h

2

10.5 km/h

3

7.2 km/h

4

5.5 km/h

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