It takes 60 seconds to go up to the second floor from the first floor to ride the escalator with a 60 steps when it is stopped.
How many seconds does it take to the second floor if you walk on this escalator at the speed of 0.5 seconds per step?
The speed to walk is 2 steps per second(1 step / 0.5 second = 2 steps/s).
Because total speed of the escalator and walking is three steps/s, it takes 20 seconds(60 steps / 3 step/s = 20 seconds).
How many seconds does it take to the second floor if you walk on this escalator at the speed of 0.5 seconds per step?
Answer
20 seconds
Solution
The speed of the escalator is 1 step per second(60 steps / 60 second = 1 step/s).
The speed to walk is 2 steps per second(1 step / 0.5 second = 2 steps/s).
Because total speed of the escalator and walking is three steps/s, it takes 20 seconds(60 steps / 3 step/s = 20 seconds).
