Salaam...Ramadan...If Someone prays Salaah in the Wrong Direction?

If the direction s/he faced for salat is understood to be wrong direction after salat is performed. There is no obligation for reperforming it. However, if there is a possibility to ask for the right direction to someone else and witout asking and searching if s/he had performed; it is compulsory to reperform the salat after learning the right direction (qibla).