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How do you get 13 minutes from a 7 minute and a 5 minute eggtimer?
Wiki User
∙ 15y ago
you flip both timers (with all of the sand on one side) and once the five minute timer runs out the first time, you flip the five minute timer. Once the nine minute timer runs out, you flip the five minute timer again. After the five minute timer has run out, it will have been 13 minutes. (5+4+4=13)
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoYou start them both at the same time. When the 5 minute timer ends, you restart the 5 minute timer and stop it when the 7 minute timer finishes (leaving 3 minutes).
You reset the 5 minute timer, let it finish and resume with the remaining 3 minutes of the 7 minute timer.
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If I had a three minute eggtimer and a five minute eggtimer and I need to boil an egg for seven minutes how would I do this?
Got a really long way to do it:1) start both timers at the same time.2) when the 3 minute one runs out lay the 5 minute one on its side to stop it (this gives you 2 mins left in 5 min one).3) start the 3 min one at the same time as turning the 5 min back up to finish the remaining 2 mins.3) when the 5 min one has finished its 2 mins, turn the 3 min on on its side (leaving 1 min one side and 2 mins the other)4) finally you can then use the 5 min one completely, then once that runs out, turn the 3 min one so the most sand is at the top- giving you 2 mins, and 7 mins in total. Phew!or:buy a watch!
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