5. [20 points] From two consecutive film frames of traffic flow along a road, one observes that there are

ten cars per kilometer having zero velocity (they are parked), 20 cars per kilometer traveling at 10 km/hr

and 40 cars per kilometer traveling at 20 km/hr.

1)

[10 pt] Determine the space mean speed and time mean speed of traffic.

2) [10 pt] If individual cars can maintain these speeds even while passing other cars, how many

cars will a driver traveling at 20km/hr pass while traveling one kilometer?