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.

Answer 1

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