If it takes Emma 20 hours to run all around the two arenas, it takes Fernando 2*20 = <<20*2=40>>40 hours to run the same distance.

Together, they take a total of 40+20 = <<40+20=60>>60 hours to run all around the arenas.

# Answer

60
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Emma can run all-around two arenas in 20 hours. If it takes Fernando twice as long to run his course, what's the total time it takes both of them to run all around the two arenas?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
60
Emma can run all-around two arenas in 20 hours. If it takes Fernando twice as long to run his course, what's the total time it takes both of them to run all around the two arenas?
train