It took 40 seconds to go up from the first floor to the second floor by escalator.
How many steps are there in this escalator?
This comes to that the speed of escalator is same as the speed of a walk.
Therefore, since the speed of escalator is also two steps per second, a number of steps is 80(2 steps × 40 seconds).
The speed to going up will be doubled if you walk along the escalator with the speed of two steps per second.
How many steps are there in this escalator?
Answer
80 steps
Solution
That the speed to going up is doubled means that the total of the speed of the walk and the escalator increased twice as much as the speed of the escalator.
This comes to that the speed of escalator is same as the speed of a walk.
Therefore, since the speed of escalator is also two steps per second, a number of steps is 80(2 steps × 40 seconds).
