/**
* Prognosis in seconds
* @param float $distance distance in km
* @return int
*/
public function inSeconds($distance)
{
if (null === $this->Strategy) {
throw new \RuntimeException('Prognosis class requires a strategy to be set.');
}
return $this->Strategy->inSeconds($distance);
}
/**
* @return bool
*/
public function isValid()
{
return null !== $this->Strategy && $this->Strategy->valuesAreValid();
}