A Race Around the Globe

Algebra Level 2

Alice, Bob, Carly, and Dave are in a flying race!

Alice's plane is twice as fast as Bob's plane.
When Alice finishes the race, the distance between her and Carly is $D.$
When Bob finishes the race, the distance between him and Dave is $D.$

If Bob's plane is three times as fast as Carly's plane, then how many times faster is Alice's plane than Dave's plane?

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