MathDB
Clock and angle

Source: Canada 2003

March 5, 2006

Problem Statement

Consider a standard twelve-hour clock whose hour and minute hands move continuously. Let mm be an integer, with 1m7201 \leq m \leq 720. At precisely mm minutes after 12:00, the angle made by the hour hand and minute hand is exactly 11^\circ. Determine all possible values of mm.