Question #3123

Stops

Started by andreaskormusis · started 2021-01-14 20:44 · last activity 2021-01-20 22:52 · 3 replies

On this question, we are tasked with getting a passenger from G to S with the least stops. Were also told that every line runs both ways. U is connected to R and that trains travel both ways. So why is it that a person cannot go from G-R-U-S? It's the same amount of stops as going G-Q-U-S and it follows the same rules. Please explain what I'm missing here. If you take that route it's the same number of stops and it doesn't require you traveling through Q.

Replies

  1. shunhe · 2021-01-15 13:38

    Hi @andreaskormusis, Thanks for the question! Remember to read the question stem carefully! We are told to not only “make the fewest possible stops,” but also to “take the fewest possible subway lines.” G-Q-U-S takes fewer lines, since G-R-U-S requires taking L3. Thus, it wins out, and so you have to go through Q. Hope this helps! Feel free to ask any other questions that you might have.

  2. andreaskormusis · 2021-01-19 20:57

    AHHHH there it is. Makes perfect sense. Thanks

  3. shunhe · 2021-01-20 22:52

    Glad I could help! Let us know if you have any further questions.

Sign in to reply.