Escalator
An escalator is moving down. A person who comes down with normal speed, takes 50 steps to come down. Another person, who is slightly faster, takes 90 steps to come down. The time taken by the first person to move 10 steps is the same as the time taken by the second person to move 90 steps.
What is the total number of steps visible when the escalator is not moving ?
Note: The faster person takes more steps because, if you don't move at all, you take 0 steps and you come down, and your speed is still slower !
What is the total number of steps visible when the escalator is not moving ?
Note: The faster person takes more steps because, if you don't move at all, you take 0 steps and you come down, and your speed is still slower !
SOLUTION
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snoyes_jw: Your equation negates the impact of the speed of the escalator. Is it possible that the speed of the escalator is relevant? Common sense seems to dicate that it would be, but your math seems good.
If the speed of the escalator mattered, it would need to be provided in the the question to produce an answer. It isn't given, so it must not matter.
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SOLUTION
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ASKER
Thank you all for confirming my answer :)
Is there any chance that the problem is worded badly and it should have been something else, so that the answer comes to be 150 ?
It is not a problem given in book, it was asked in an interview !
Is there any chance that the problem is worded badly and it should have been something else, so that the answer comes to be 150 ?
It is not a problem given in book, it was asked in an interview !
Perhaps the point of the question is more about your confidence in your own results, and your tact in asserting the the interviewer is wrong...
SOLUTION
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ASKER
Thanks for all of your answers. Here is the original question:
http://aucse.com/infosys-sample%20paper%204.htm
I am increasing the points and splitting..
http://aucse.com/infosys-sample%20paper%204.htm
I am increasing the points and splitting..
ASKER
Any ideas ? or is it wrong ?