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Sonia takes 50 minutes to ride her bicycle from home to school. She takes 25 minutes to ride her bicycle back to home along the same route. The distance from school to home is 6 km. What is her average speed in kilometers per hour for the round trip?
Options :-
- 4.8 km/hr
- 6.8 km/hr
- 9.6 km/hr
- 10.9 km/hr
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