We could use the newly developed hybrid cars but the problem is not everyone can afford one.
You can push start a car with a standard transmission. Place the car in neutral. Push the car to a brisk speed. Mash down the clutch pedal and place the gear selector in 2nd gear. Pop the clutch, and...
Because that's just the way they it is
... and so? What is the question?
3:4 or 6:8