Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are traveling at 30 mi/h, all vehicles in lane 2 are traveling at 45 mi/h, and all vehicles in lane 3 are traveling at 60 mi/h. There is also a constant spacing of 0.5 mile between vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 30 minutes, what will be the time-mean speed and space mean speed for this traffic stream

Assume you are an observer standing at a point along a three-lane roadway. All vehicles
in lane 1 are traveling at 30 mi/h, all vehicles in lane 2 are traveling at 45 mi/h, and all
vehicles in lane 3 are traveling at 60 mi/h. There is also a constant spacing of 0.5 mile
between vehicles. If you collect spot speed data for all vehicles as they cross your
observation point, for 30 minutes, what will be the time-mean speed and space mean
speed for this traffic stream?