3.19 Why and When HM

  • When there are rates associated, say speed, and numerator is fixed.
  • \(Speed, v = \frac{S}{t}\); HM if S is fixed
  • Example: A man travels 120 km the first day at 12 kph, the same distance at 10 kph on the 2nd day, and at 8 kph on the 3rd day. Find his average speed.