Question

til avlage Speeu.
1. A man has to cover a distance of 1 km. He covers the
first 200 m walking at a rate of 40 m min-'. How fast
should he run to cover the remaining distance, such
that his average speed for the entire trip is 100 m min?
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Answer 1

In 200/3 m min-1

You can find it by doing harmonic mean