Mr. Gupta decided to walk down the escalator of a mall. He found that if he steps down 26 steps, he requires 30 seconds to reach the bottom. However, if he steps down 34 steps, he would only require 18 seconds to get to the bottom. If the time is measured from the moment the top step begins to descend to the time he steps off the last step at the bottom, find out the height of the escalator in steps?