Explanation
-(스)ㅂ니까? is the question form of the formal ending -(스)ㅂ니다. Use -ㅂ니까? after a stem ending in a vowel (가다 → 갑니까?) and -습니까? after a consonant (먹다 → 먹습니까?); the past and future forms stack the same way (갔습니까?, 가겠습니까?). It is the register of news, announcements, the workplace and first meetings, so it sounds stiff between friends. 어디에 갑니까? — Where are you going?