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The distance between Paula's house and h...

The distance between Paula's house and her school is 12 km. The distance between her school and the public library is 6 km, whereas the distance between the public library and her house is 15 km. Paula reaches her school from home in half an hour and then takes another 15 minutes to reach the public library. She further takes 15 minutes to come back home from the public library. What was Paula's average speed during the entire trip?

A

11 km/h

B

22 km/h

C

33 km/h

D

44 km/h

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