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Use the stairs! (Posted on 2008-09-12) Difficulty: 2 of 5
You walk upwards on an escalator, with a speed of 1 step per second. After 50 steps you are at the end. You turn around and run downwards with a speed of 5 steps per second. After 125 steps you are back at the beginning of the escalator.

The Question:
How many steps do you need if the escalator stands still?

For something somewhat related please see "Walking down an escalator".

No Solution Yet Submitted by Andre    
Rating: 4.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Escalated solution | Comment 2 of 4 |

The escalator is 100 stairs and rises 1 step each second.

Ascending the escalator,
50 steps + (50/1) seconds of stair rises = 100.

Descending the escalator,
125 steps - (125/5) seconds of stair rises = 100.

200 steps will be taken to ascend and descend the
non-moving escalator.

 


 


  Posted by Dej Mar on 2008-09-12 12:37:18
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