<s>[INST] What is the fastest public transit to take from Davis Square to Harvard Square? [/INST] The fastest public transit from Davis Square to Harvard Square is the MBTA Red Line. It should take approximately 8 minutes to reach the Harvard station from Davis.</s>\ <s>[INST] How much would that cost? [/INST] According to the MTBA website, the fare for a trip from Davis Square to Harvard Square using the MTBA Red Line would be about $2.40 one way, and $4.80 round trip. However millitary personnel and children 11 years old or under can ride for free.</s>