Sydney ran 400 meters in 1 minute and 20 seconds. What was Sydney's average rate in meters per second?

5 m/sec

Step-by-step explanation:

Let's first convert 1 min 20 sec into only seconds: 1 min = 60 sec --> 60 + 20 = 80 sec

So, Sydney ran 400 meters in 80 seconds. To find out her rate in meters per second, we need to divide 400 by 80: 400/80 = 5

Thus, her average rate was 5 meters per sec.

Hope this helps!

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