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0 / 60 seg.
Why is a manhole round? Why is it better to have round manhole covers compared to square manhole covers?
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Clue
LET'S NAME THE ROPES AS A AND B. LIGHT A FROM BOTH THE ENDS AND B FROM ONE END. WHEN A IS FINISHED BURNING WE KNOW THAT 30 MINUTES HAVE ELAPSED AND B HAS 30 MINUTES REMAINING. NOW, LIGHT THE OTHER NON-BURNING END OF B AND START THE TIMER. WHEN B IS FINISHED BURNING, STOP THE TIMER AS 15 MINUTES HAVE ELAPSED
IN 15 MINUTES. START WITH STEAK 1 AND STEAK 2. AFTER FIVE MINUTES YOU TAKE STEAK 1 OFF, START TO FRY STEAK 3 AND TURN OVER STEAK 2. AFTER 10 MINUTES STEAK 2 IS READY AND STEAK 1 AND STEAK 3 NEED TO BE FINISHED ON THE SECOND SIDE. REMOVE STEAK 2, AND FRY THE OTHER SIDE OF STEAK 1 AND STEAK 3
NOMINATE ONE PRISONER WHO IS ALLOWED TO TURN THE LIGHT BULB OFF. THE REST OF THE PRISONERS ARE ALLOWED TO TURN ON THE LIGHT BULB IF THEY THEY HAVE NEVER TURNED IT ON BEFORE. IF THEY HAVE TURNED IT ON BEFORE THEY ARE NOT SUPPOSED TO FLIP THE SWITCH OR SAY ANYTHING. THE PRISONER THAT CAN TURN IT OFF THEN KNOWS THEY HAVE ALL BEEN THERE AND SAVES THEM ALL WHEN HE HAS TURNED IT OFF 99 TIMES
A SQUARE MANHOLE COVER CAN FALL INTO THE MANHOLE AS THE DIAGONAL LENGTH OF A SQUARE MANHOLE IS GREATER THAN THE SIDES. A ROUND MANHOLE COVER CAN NEVER FALL INTO THE MANHOLE
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