human
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?
assistant
How long does it take Fernando to run the same distance? ** 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.
How long does it take Emma and Fernando to run all around the two arenas? ** Together, they take a total of 40+20 = <<40+20=60>>60 hours to run all around the arenas.
#### 60