Respuesta :
Answer:
The average speed for the entire trip rounded to the nearest tenth is 17.5 mi/h.
Step-by-step explanation:
Step 1 Explanation and Formula
Average speed is defined as the total distance divided by time. Average can be determined by this equation :
v = d/t
where v is average speed, d is distance and t is time.
From the question above, we know that :
the distance which Lisa traveled is the same so we can conclude that Lisa's average speed is
v = (v1 + v2) / 2
where v1 is average speed going to school and v2 is average speed on the return.
v1 = 15 mi/h
v2 = 20 mi/h
Step 2 Calculation
v = (v1 + v2)/2
v = (15 + 20)/2
v = 35 / 2
v = 17.5 mi/h
Hence, the average speed for the entire trip rounded to the nearest tenth is 17.5 mi/h
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