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Walking down an escalator (Posted on 2006-03-29) Difficulty: 3 of 5
On a working escalator, one man walking down it took 50 steps. Another man, walking three times faster, took 75 steps.

How many steps would each man take going down the same escalator during a power outage?

No Solution Yet Submitted by Jer    
Rating: 3.3333 (3 votes)

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Solution Algebraic solution (spoiler) | Comment 1 of 10
Let v = the velocity of the escalator (down)
m = the velocity of the first man (down)
s = the number of steps on the escalator

The velocity of the second man is 3m
The amount of time for each man to go down is 50/m and 75/(3m) respectively

50 + v(50/m) = s
75 + v(75/3m) = s
v/m = s/50 - 1
75 + 25(s/50 - 1) = s
50 = s/2
s = 100 steps

That is, unless someone falls because it's so dark.

  Posted by Tristan on 2006-03-29 20:37:17
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