Fog
The car started in fog at a speed of 30 km/h. After a 12-minute drive, the fog dissipated, and the driver drove the next 12-minute distance, 17 km. The driving conditions deteriorated during the last 17 km, and the driver drove at 51 km/h.
a) Calculate the distance of the first section, the speed of the second section, and the time in the third section.
b) Construct the graph distance vs. time t.
c) Calculate the average speed for the first two sections and the average speed for the last two sections. When can the average rate be calculated as the arithmetic mean of the individual speeds? Judge answer.
a) Calculate the distance of the first section, the speed of the second section, and the time in the third section.
b) Construct the graph distance vs. time t.
c) Calculate the average speed for the first two sections and the average speed for the last two sections. When can the average rate be calculated as the arithmetic mean of the individual speeds? Judge answer.
Correct answer:
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