Chapter 1 - Tools of Geometry - 1-4 Measuring Angles - Practice and Problem-Solving Exercises - Page 32: 35

30

A clock has 12 sections. A clock is a circle, and circles have 360 degrees, so each section is 360/12=30 degrees. At 11:00, the minute hand is at 12 and the hour hand is at 11, so there is exactly 1 section. Multiply the degrees per section (30) by the number of sections (1) to get $30*1=30$.