Question 588375
It takes 60 seconds to walk up a broken escalator and 40 seconds to ride up the same escalator when it is moving.
  How long will it take to walk up the same escalator when it is moving?
:
Assume the length of the escalator is 60 ft
then
Walking: 1 ft/sec
moving: 60/40 = 1.5 ft/sec
walking & moving 2.5 ft/sec
:
Find the time at 2.5 ft/sec
t = 60/2.5 = 24 seconds walking & moving