The Escalator
"I counted fifty steps that I made in going down the escalator," said Walker. "I counted seventy-five steps," said Trotman; "but I was walking down three times as quickly as you." If the staircase were stopped, how many steps would be visible? It is assumed that each man travelled at a uniform rate, and the speed of the staircase was also constant.
The answer is 100.
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