A bus line has stops at every intersection, 200 m apart. The speed of traffic and of the buses except for their stopping at bus stops is 30 km/h, but for every stopping, buses lose a total of t, = 20 s. Passengers are uniformly distributed along the line and walk to/from its stops at a speed of V.., = 4.8 km/h. How would a passenger's total travel time, including access to/from stops and travel on buses, change if every other stop was abandoned, i.e., the spacing between stops was increased from 200 to 400 m, if the average trip length on the line is: a) 4 km; b) 6 km; c) 8 km? For what passeng,. trip length LP will the total travel time remain the same