Exercise: parse hours log file and create report

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The log file looks like this

examples/regex/timelog.log

09:20 Introduction
11:00 Exercises
11:15 Break
11:35 Numbers and strings
12:30 Lunch Break
13:30 Exercises
14:10 Solutions
14:30 Break
14:40 Lists
15:40 Exercises
17:00 Solutions
17:30 End

09:30 Lists and Tuples
10:30 Break
10:50 Exercises
12:00 Solutions
12:30 Dictionaries
12:45 Lunch Break
14:15 Exercises
16:00 Solutions
16:15 Break
16:30 Functions
17:00 Exercises
17:30 End

the report should look something like this:

examples/regex/timelog.txt

09:20-11:00 Introduction
11:00-11:15 Exercises
11:15-11:35 Break
11:35-12:30 Numbers and strings
12:30-13:30 Lunch Break
13:30-14:10 Exercises
14:10-14:30 Solutions
14:30-14:40 Break
14:40-15:40 Lists
15:40-17:00 Exercises
17:00-17:30 Solutions

09:30-10:30 Lists and Tuples
10:30-10:50 Break
10:50-12:00 Exercises
12:00-12:30 Solutions
12:30-12:45 Dictionaries
12:45-14:15 Lunch Break
14:15-16:00 Exercises
16:00-16:15 Solutions
16:15-16:30 Break
16:30-17:00 Functions
17:00-17:30 Exercises

Break                      65 minutes    6%
Dictionaries               15 minutes    1%
Exercises                 340 minutes   35%
Functions                  30 minutes    3%
Introduction              100 minutes   10%
Lists                      60 minutes    6%
Lists and Tuples           60 minutes    6%
Lunch Break               150 minutes   15%
Numbers and strings        55 minutes    5%
Solutions                  95 minutes    9%