physics
motion
Easy

Question

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 min. is equal to:

  1. km/h
  2. 25 over 4 space k m divided by h
  3. 30 over 4 space k m divided by h
  4. 45 over 8 space k m divided by h

The correct answer is: 45 over 8 space k m divided by h

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