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Couriers A and B deliver at their respective uniform rates. How many more minutes does it take Courier B, working alone, to deliver x packages than it takes Courier A, working alone?

(1). Couriers A and B, working together, deliver the same x packages in 2/3 the time that Courier A, working alone, does

(2). Courier B, working alone, delivers the same x packages in twice the time that Courier A, working alone, does

### Select one of the following: