Final answer:
Sarah's rate of speed for the 400m hurdles is 5.9 meters per second, calculated by dividing the distance of 400 meters by the time of 67.7 seconds.
Step-by-step explanation:
To calculate the rate at which Sarah ran the 400m hurdles, we divide the distance by the time taken to complete the race. Here's the calculation step-by-step:
The answer, therefore, is Option A. 5.9 m/s, which is Sarah's average speed for the 400m hurdles.