a. What is the marginal social benefit when the total distance travelled is 60 miles?
b. When the three people travel a total of 60 miles, how many miles does each travel and what is the marginal private benefit of each traveler?
The table gives the demand schedules for train travel for the only buyers in the market, Ann, Beth, and Cy.

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Quantity demanded imiles) Price (dollars per mile) Ann Beth Cy 25 20 15 10 20 15 10 30 25 15 10