Let G = (N, A) denote the road network of the greater Boston area. Four people living in the suburbs form a car pool. They drive in separate cars to a common meeting point and drive from there in a van to a common point in downtown Boston. Suggest a method for identifying the common meeting point that minimizes the total driving time of all the participants. Also, suggest a method for identifying the common meeting point that minimizes the maximum travel time of anyone person.