An athlete runs 300 m up a hill at a steady speed of 3.0 m/s. she then immediately runs the same distance at 6.0 m/s . what is her average speed for 600 m run?

4.0 m/s

Explanation:

In the first part of the run, the athlete runs a distance of

at a speed of

So, the time he/she takes is

In the second part of the run, the athlete covers an additional distance of

with a speed

So, the time taken in this second part is

So, the total distance covered is

d = 300 m + 300 m = 600 m

And the total time taken

t = 100 s + 50 s = 150 s

Therefore, the average speed for the entire trip is

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