I may be wrong, but I think this is impossible without knowing the speed of the escalator
need help with this question.
Walking down a certain escalator descending at a constant rate, if I take 30 seconds to reach the bottom, I have to walk down 13 consecutive steps. If i take 21 seconds to reach the bottom, I have to walk down 19 consecutive steps. The number of steps showing on this escalator at any one time is:
a) 32 b) 33 c) 34 d) 35 e) 36
No chokful, although it might not seem like it, there is enough information available.
Walking down 13 steps gave a time of 30 seconds.
Walking down 19 steps gave a time of 21 seconds.
Therefore walking down 6 steps would take a total of seconds, giving us a rate of steps per second.
So the total number of steps on the escalator at any given time is given by
Amount of steps walked down + (Steps per second rate Time taken)
I'll leave it to you to work out the answer, make sure you get the same answer for both of the cases (you will )