Using the concept of average speed we conclude that the space-mean speed of the vehicles is 0.69 km/min.
The average speed of a vehicle traveling a given segment of a highway in a specific time period is called space-mean speed, i.e.
Average mean speed = total distance traveled / average time travel
Given for vehicles are traversing a 1 km segment of highway. Hence total distance is 4km.
Average time = (1.2 + 1.5 + 1.7 + 1.4)/4
= 5.8/4
= 1.45 min
Now Average mean speed = 1/1.45
=0.689
=0.69 km/min
Hence the space-mean speed of the vehicles is 0.69 km/min
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