HKIMO 2018 Grade 6 National Final (Heat) Set 03 Question 23

What is the earliest time between 2 pm and 3 pm when the hour and minute hands are perpendicular?

Source glossary (English–Vietnamese): Nearest time: thời gian sớm nhất; Hour hand: kim giờ; Minute hand: kim phút; Perpendicular: vuông góc; Between: giữa.