The figure above represents the floor plan of an art gallery that has a lobby and \(18\) rooms. If Lisa goes from the

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The figure above represents the floor plan of an art gallery that has a lobby and \(18\) rooms. If Lisa goes from the lobby into room \(A\) at the same time that Paul goes from the lobby into room \(R,\) and each goes through all of the rooms in succession, entering by one door and exiting by the other, which room will they be in at the same time?

(1) Lisa spends \(2x\) minutes in each room and Paul spends \(3x\) minutes in each room.
(2) Lisa spends \(10\) minutes less time in each room than Paul does.

Answer: A

Source: GMAT Paper Tests