Task: Question Answering
Input (English): Problem: there is a escalator and 2 persons move down it . a takes 50 steps and b takes 75 steps while the escalator is moving down . given that the time taken by a to take 1 step is equal to time taken by b to take 3 steps . find the no . of steps in the escalator while it is staionary ? 
Options: a ) 60 , b ) 70 , c ) 80 , d ) 90 , e ) 100
Output (English): e