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More Problems from Kinematics

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Shailay Watson asks:

  1. “On a 120 km track, a train moves the first 30 km at a uniform speed of 30 km/h. How fast must the train in the next 90 km so as to have average speed 60 km/h for the entire trip?”
  2. “A person goes form one place to another on bike
    with uniform speed 40 km/h and returns back at
    uniform speed of 60 km/h. Find average speed
    during the journey.”

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