Mrs. Healthy walked along a running track at 2400 m/h. She took 4 min more than Mrs Wise to walk the entire length of the track once. If the track is 800 m ling, Mrs Wise's average speed was ____ m/min.

since time = distance/speed,

Mrs Healthy took

800m/(2400 m/hr) = 1/3 hr = 20 min

So, Mrs Wise's speed = 800m/16min = 50m/min = 3000m/hr

To find Mrs. Wise's average speed, we need to calculate the time it took her to walk the entire length of the track.

Let's start by calculating the time it took Mrs. Healthy to walk the entire track once. We know that her speed is 2400 m/h, and the length of the track is 800 m.

Time = Distance / Speed
Time = 800 m / 2400 m/h

Now, we need to find out how much longer it took Mrs. Healthy compared to Mrs. Wise. According to the information given, Mrs. Healthy took 4 minutes more.

So, the total time it took Mrs. Healthy is equal to the time taken by Mrs. Wise plus an additional 4 minutes.

Now, we can set up an equation:

Time taken by Mrs. Healthy = Time taken by Mrs. Wise + 4 minutes

Now we can substitute the values we have:

800 m / 2400 m/h = (800 m / x) + 4 minutes

Let's solve for x, Mrs. Wise's average speed (in m/min):

800 m / 2400 m/h = 800 m / x

Cross-multiplying, we get:

800 m * x = 2400 m/h * 800 m
800x = 2400 * 800

Now we can divide both sides by 800:

x = (2400 * 800) / 800

Simplifying further:

x = 2400

Therefore, Mrs. Wise's average speed was 2400 m/min.