If someone wants to cook food for 9 minutes with no breaks. However, they only have a 4 minute and a 7 minute timers. Neither timer has any marks on it, so each can only be used for the full amount of time. How can the two be combined to time 9 minutes?
2007-09-04 09:54:58 · 7 answers · asked by jakey 1 in Education & Reference ➔ Trivia
assuming these are hour glass style of timers
start both timers simultaneously, when the 4 minute timer runs out restart it, when the 7 minute timer runs out start cooking, the 4 minute timer has 1 minute remaining, after the 4 minute timer runs out that last 1 minute restart it 2 more times, (when the 4 minute timer runs out restart it, when the 4 minute timer runs out, you're done) it has been 9 minutes
2007-09-05 18:24:45 · answer #1 · answered by Greg W 2 · 0⤊ 0⤋
Start the 7 minute time after the 4 minute timer has ran for 2 minutes
or start the 4 minute timer after the 7 minute has ran for 2 minutes
by the time the second timer goes off the food is done
2007-09-04 10:54:17 · answer #2 · answered by Jennifer B 3 · 0⤊ 1⤋
Start both together.
At 4 mins, restart the 4
At 7 mins, restart the 7
At 8 mins, restart the 4 again
At 12 mins, the 4 ends a third time - START COOKING
At 14 mins, restart the 7
At 21 mins, the 7 ends again. STOP COOKING
The food was cooked for 21 - 12 = 9 minutes.
OR
Go and buy a better timer.
2007-09-04 10:04:42 · answer #3 · answered by Beardo 7 · 7⤊ 0⤋
put it on 7 minutes and then put it in the middle of 4 which is 2
2007-09-04 11:36:31 · answer #4 · answered by Anonymous · 0⤊ 1⤋
Cook something twice (18 minutes total tiem)
2007-09-04 09:59:54 · answer #5 · answered by Goethe's Ghostwriter 7 · 0⤊ 2⤋
wait for the seven one to finish then do the 4 one to finish but wait untill it is halfway then check your food
2007-09-04 11:11:07 · answer #6 · answered by justme 3 · 0⤊ 1⤋
Interesting, please reveal this answer eventually.
2007-09-04 10:00:47 · answer #7 · answered by Serpico7 5 · 0⤊ 0⤋