Henry Ernest Dudeney/Puzzles and Curious Problems/68 - The Moving Staircase

by : $68$

 * The Moving Staircase
 * "I counted $50$ steps that I made in going down the moving staircase," said Walker.
 * "I counted $75$ 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.