Task: Question Answering
Input (English): Problem: mr . das decided to walk down the escalator of a mall . he found that if he walks down 26 steps , he requires 30 seconds to reach the bottom . however , if he steps down 34 stair she 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 stair way insteps ? 
Options: a ) 5 , b ) 6 , c ) 7 , d ) 8 , e ) 9
Output (English): b