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## Discussion topic: Puzzles & Brain Teasers : Up an Escalator

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 Page 1 of 1 From: syvum Reply 1 of 2 Reply Subject: Puzzles & Brain Teasers : Up an Escalator ``` Discuss this puzzle with other Syvum members in this forum. If you have alternative solution procedures, or questions about this puzzles, feel free to post them here.```Posted at: Sun Jul 13 03:39:21 2003 (GMT) From: myadalo Reply 2 of 2 Reply Subject: Just some thoughts....... ``` In the solution provided, the reduction in the number of steps run from 15 to 7 (=8) causes an increase in time from 17.5s to 37.5s (=20s). 20/8=2.5s is the time for 1 step to go up on its own. How can we calculate the total number of steps by 7 + 37.5/2.5? 37.5s is the total time for the escalator to go up including running 7 out of all steps. If we use 37.5/2.5, we are assuming every step is taking a constant 2.5s but how can this be possible when some steps are run up while others are not? What if we look at it this way? Running 8 more steps reduces the travel time by 20s. 2.5s will then refers to the time taken to run up a step. If he never run at all as compared to running 7 steps, increases the time travel by 17.5s (7 x 2.5s). Thus total time needed = 37.5s + 17.5s = 55s. My doubt is: if this is also correct, how can the time taken to run up a step = time the escalator go up by a step on its own (i.e both 2.5s)??? ```Posted at: Fri Feb 18 18:47:22 2005 (GMT) Page 1 of 1

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