Reena reaches a birthday party 20 min late if she walks 3 km/h from her house. If she increases her speed to 4 km/h she would reach 30 min early, then the distance between her house and the venue of the birthday party is
A4 km
B9 km
C7 km
D10 km
A4 km
B9 km
C7 km
D10 km
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