code: @Pure
  	public static double toMetersPerSecond(double value, SpeedUnit inputUnit) {
  		switch (inputUnit) {
  		case KILOMETERS_PER_HOUR:
  			return 3.6 * value;
  		case MILLIMETERS_PER_SECOND:
  			return value / 1000.;
  		case METERS_PER_SECOND:
  		default:
  		}
  		return value;
  	}
docs: Convert the given value expressed in the given unit to meters per second.
  
  @param value is the value to convert
  @param inputUnit is the unit of the {@code value}
  @return the result of the convertion.