<image>Class 5(1) students climbed Tiantai Mountain, and the journey from school to Tiantai Mountain is as follows: 
 
1. The students took ____ hours to reach the mountain top. 
2. During which time period did they rest? How many times did they rest? What was the total rest time? 
3. Please describe the journey of Class 5(1) climbing Tiantai Mountain.