Question Statement :

Arun can walk up in a moving escalator (upwards) in 30 s. He can walk down this moving ‘up’ escalator in 90 s. Assume that his walking speed is the same both upwards and downwards. How much time (in seconds) will he take to get to the top of the escalator when he is not moving?

Type in your answer as an integer. For example, if your answer is 12.5 seconds, type in 13