30 hours is 30 / 5 = <<30/5=6>>6 times more time.

So the spider would be able to catch 6 * 9 = <<6*9=54>>54 flies.

# Answer

54
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
During 5 hours, a spider can catch 9 flies. How many flies would this spider catch in 30 hours if he would keep his efficiency?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
54
During 5 hours, a spider can catch 9 flies. How many flies would this spider catch in 30 hours if he would keep his efficiency?
train