SOLUTION: Tommy likes to run up and down an "up" elevator. Going up he can cover 30 steps in 6 seconds. Going down it takes him 15 seconds to cover 30 steps.
Question 964812: Tommy likes to run up and down an "up" elevator. Going up he can cover 30 steps in 6 seconds. Going down it takes him 15 seconds to cover 30 steps. Answer by Alan3354(69443) (Show Source):