If a person walks up a escalator at rest in 90 sec and he goes up in 60sec on moving escalator.What is the time taken by him to walk up the moving escalator ?
The answer is 36 sec.
The question says
Man speed is x /90 and the speed of escalator is x /60 where x is the distance.
The combined speed is x /90+x/60 =150x/540
Therefore time taken is 36 sec for x distance when the man is walking on a moving escalator.
Ans is 36s