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0 / 60 seg.
A man goes upstairs to grab his time machine. He walks downstairs then goes back in time 200 years. Why did he go downstairs?
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Clue
THE MAN IS A DWARF. HE CAN'T REACH THE UPPER ELEVATOR BUTTONS, BUT HE CAN ASK PEOPLE TO PUSH THEM FOR HIM. IF IT IS RAINING, HE PUSHES THE BUTTONS WITH HIS UMBRELLA
BECAUSE IF HE WENT BACK IN TIME FROM UPSTAIRS, THAT WOULD BE A NASTY FALL BECAUSE THE HOUSE WOULDN'T HAVE BEEN THERE 200 YEARS AGO
LET: CAMPER 1 = C1 (1) CAMPER 2 = C2 (2) CAMPER 3 = C3 (5) CAMPER 4 = C4 (10) THIS IS HOW THEY CROSS THE BRIDGE: C1,C2 → (2) ← C2 (2) C3,C4 → (10) ← C1 (1) C1,C2 → (2) THE TIME IN BRACKETS () INDICATE THE TIME TAKEN TO CROSS THE BRIDGE. IF YOU SUM THEM UP, IT WILL ADD UP TO 17 MINUTES
YES, THERE IS A POINT ALONG THE PATH THAT THE MONK OCCUPIES AT PRECISELY THE SAME TIME ON BOTH DAYS. IF YOU ASSUME THAT THE THERE ARE TWO MONKS, ONE DOES THE ROUTE FROM THE TOP, AND THE OTHER FROM THE BOTTOM. AT SOME POINT, THEY MUST MEET. THERE'S YOUR POINT
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