public void CalculateRunTime()
{
_calculator = new Calculator.Calculator();
var distance = new Distance(SelectedKilometer.Title, SelectedMeter.Title, SelectedCentimeter.Title);
var date = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, SelectedHour.Title,
SelectedMinute.Title, SelectedSecond.Title);
var kmh = _calculator.CalculateKilometersPerHour(distance, date);
var minKm = _calculator.CalculateMinutePerKilometer(kmh);
if (kmh.Value <= 0.0 || minKm.Minutes <= 0) return;
// Navigate to result page --- publish result message
_navigationService.NavigateToViewModel<ResultItemDetailViewModel>();
_eventAggregator.Publish(new ResultMessage {Distance = distance, Date = date, KilometerPerHour = kmh, MinutePerKilometer = minKm});
}