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A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?

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Answer:

88.9 km/h

Step-by-step explanation:

Average speed = total distance / total time

The total distance is:

d = 160 km + 160 km

d = 320 km

The total time is:

t = (160 km) / (80 km/h) + (160 km) / (100 km/h)

t = 2 h + 1.6 h

t = 3.6 h

Therefore, the average speed is:

s = 320 km / 3.6 h

s = 88.9 km/h

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