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9
M _ N _ T _ S Clue
TURN OVER BOTH HOURGLASSES AT ONCE. WHEN THE FOUR-MINUTE HOURGLASS RUNS OUT, TURN IT OVER. WHEN THE SEVEN-MINUTE HOURGLASS RUNS OUT, TURN IT OVER. WHEN THE FOUR-MINUTE TIMER RUNS OUT THIS TIME (EIGHT MINUTES HAVE ELAPSED), THE SEVEN-MINUTE HOURGLASS HAS BEEN RUNNING FOR ONE MINUTE. NOW TURN OVER THE SEVEN MINUTE TIMER BACK OVER. WHEN THE TIMER RUNS OUT, NINE MINUTES HAVE ELAPSED WHEN THE PROFESSOR CONFIRMED JOHNNY'S ANONYMITY (THE PROFESSOR DIDN'T KNOW WHO HE WAS), JOHNNY QUICKLY SLIPPED HIS EXAM PAPER INTO THE PILE OF EXAMS AND RAN OFF, SO THE PROFESSOR WOULDN'T KNOW WHICH EXAM PAPER DESERVED AN F. CONGRATULATIONS ON STICKING THROUGH THE WHOLE RIDDLE THERE ARE TWO POSSIBLE SOLUTIONS (AND MAYBE MORE). SOLUTION 1: LIE THE CANDLES HORIZONTALLY NEXT TO EACH OTHER, BUT WITH THE WICKS AT OPPOSITE ENDS. LIGHT BOTH THE CANDLES. WHEN THEY MEET, THEY'LL HAVE BOTH BURNED HALFWAY - 30 MINUTES GONE. NOW BLOW ONE OUT. LET THE OTHER BURN THE REST OF ITS 30 MINUTE LIFESPAN - NOW YOU'VE TIMED 60 MINUTES. WHEN IT GOES OUT, RELIGHT THE OTHER ONE FOR THE REMAINING 30 MINUTES - TOTAL OF 90 MINUTES. SOLUTION 2: FIRST LIGHT UP THE TWO ENDS OF THE FIRST CANDLE. WHEN IT HAS FULLY BURNED, LIGHT UP ONE END OF THE SECOND CANDLE. FIRST CANDLE TAKES 30 MINS TO BURN OUT AND SECOND CANDLE WILL TAKE 60 MINS - TOTAL OF 90 MINUTES START BOILING THE EGGS AND START BOTH THE HOURGLASSES - ALL AT THE SAME TIME. WHEN THE 4-MINUTE HOURGLASS RUNS OUT, TURN IT OVER IMMEDIATELY SO THAT IT WILL START COUNTING 4-MINUTES AGAIN. WHEN THE 7-MINUTE HOURGLASS RUNS OUT, TURN IT OVER IMMEDIATELY. AT THIS TIME, THE 4-MINUTE HOURGLASS WILL HAVE 1 MINUTE REMAINING. AT THE 8TH MINUTE, THE MOMENT THE 4-MINUTE HOURGLASS RUNS OUT FOR THE SECOND TIME, TURN THE 7-MINUTE HOURGLASS OVER - IT WOULD HAVE BEEN RUNNING FOR EXACTLY ONE MINUTE. WHEN THE 7-MINUTE HOURGLASS RUNS OUT, THAT WILL BE 9 MINUTES