If Lexie takes 20 minutes to run a mile, Celia takes 20/2 = <<20/2=10>>10 minutes to run the same distance since she is twice as fast.

Celia takes 10 minutes to run one mile so it will take 10*30 = <<10*30=300>>300 minutes to run 30 miles.

# Answer

300
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Celia runs twice as fast as Lexie. If it takes Lexie 20 minutes to run a mile, how long, in minutes, will it take Celia to 30 miles?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
300
Celia runs twice as fast as Lexie. If it takes Lexie 20 minutes to run a mile, how long, in minutes, will it take Celia to 30 miles?
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