The man should be at the floor before he call for the elevator.

My English is so poor....

I still do not understand.

In the example case.

If Petr go to floor 45:
      He take 4.8*5 = 24 second to go to floor 45.
      The elevator take 0.2*48 + 15 + 0.2*44 = 33.4 seconds to go to floor 1, stop there 15 seconds, and then go up to floor 45.
      So, Petr must wait for 33.4-24 = 9.4 secs, go in for 5 secs, and go down take 44*0.2 = 8.8 secs
      The total time is 24 + 9.4 + 5 + 8.8 = 47.2 secs

Now compare with Pert go to floor 44:
      He take 4.8*6 = 28.8 second to go to floor 44.
      The elevator take 0.2*48 + 15 + 0.2*43 = 33.2 seconds to go to floor 1, stop there 15 seconds, and then go up to floor 44.
      So, Petr must wait for 33.2-28.8 = 4.4 secs, go in for 5 secs, and go down take 43*0.2 = 8.6 secs
      The total time is 28.8 + 4.4 + 5 + 8.6 = 46.8 secs!

So, go to floor 44 is better, isn't it?

Edited: uh oh... I misunderstand the question. The elevator will no go up till Petr press the button of elevator. Sorry.

Edited by author 07.03.2008 18:57

I understand too...


Edited by author 25.03.2008 23:50