The second movie was 2*.5=<<2*.5=1>>1` hour longer than the first movie

So the second movie was 2+1=<<2+1=3>>3 hours long

That means the first two movies had a combined time of 3+2=<<3+2=5>>5 hours

So the last movie had a length of 5-1=<<5-1=4>>4 hours

That means the marathon lasted 5+4=<<5+4=9>>9 hours

# Answer

9
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tim decides to do a movie marathon.  The first movie is 2 hours long.  The next movie is 50% longer.  And the last movie is 1 hour shorter than the combined time of the previous 2 movies.  How long was his movie marathon?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
9
Tim decides to do a movie marathon.  The first movie is 2 hours long.  The next movie is 50% longer.  And the last movie is 1 hour shorter than the combined time of the previous 2 movies.  How long was his movie marathon?
train