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vacebi

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  1. Before the new road: Section AP takes 20 minutes. Section PB takes T/10 minutes, where T is the number of cars on the road. Section AQ takes T/10 minutes. Section QB takes 20 minutes. So, the total time of travel from A to B before the new road is: Total Time = 20 minutes (AP) + T/10 minutes (PB) + T/10 minutes (AQ) + 20 minutes (QB) Now, with the new road that doesn't take any time, the total time of travel from A to B becomes: Total Time = 20 minutes (AP) + 0 minutes (PQ) + 20 minutes (QB) As you can see, the section PB and AQ times are no longer dependent on the number of cars (T/10), and they are replaced by the instantaneous PQ connection, which takes no time.

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