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M _ N _ T _ S Clue
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 60 MINUTES. MANY OF YOU PROBABLY THINK THAT THEY SHOULD MULTIPLY 3 PILLS BY 30 MINUTES TO GIVE 90 MINUTES. BUT THINK OF HOW YOU TAKE THE PILLS. YOU TAKE THE FIRST PILL, AND IN A HALF-HOUR YOU TAKE THE SECOND PILL, AND THEN IN THE NEXT HALF-HOUR YOU TAKE THE THIRD PILL. SO THE NUMBER OF MINUTES THAT PASS FROM THE FIRST TO THE THIRD PILL IS 60 MINUTES 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 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