a moving sidewalk in an airport terminal builiding moves at a speed of 2.5 m/s relative to the ground and is 75 m long. a person trots from one end of the walkwy to the other at a speed of 6 m/s relative to the moving sidewalk. suppose the person on the moving sidewalk was able to trot first to one end, and then trot back to her starting point, always moving at 6 m/s relative to the sidewalk. what is ttot, the total time for such a round trip?