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 ?
Class 9th
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200 km apart at an average speed of 40 km/h . The average speed of the man over the entire distance of 400 km
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