A Grundo, a Gnorbu, a Gelert, and a Grarrl need to walk from Sakhmet to Qasala during a really bad heat wave. The heat is so bad, it's not possible to cross the open desert without some sort of shade. Fortunately, they have one umbrella. Unfortunately, however, only a maximum of two pets at a time can fit under the umbrella. The Grundo can cross the desert alone in 20 minutes. The Gnorbu can make the crossing alone in 16 minutes. The Grarrl can make the crossing alone in 8 minutes. And the Gelert can make the crossing in 4 minutes. Note that when two pets are making the crossing, they must do so at the pace of the slower pet!
What is the minimum number of minutes that it will take for all of the pets to safely be together in Qasala?
2006-07-31 06:56:21 · 11 answers · asked by sweetpeaches_6915 2 in Science & Mathematics ➔ Mathematics
This is an old one.
Grarri and Gelert go over. 8 minutes cumulative.
Grarri comes back. 16 minutes.
Grundo and Gnorbu go over. 36 minutes.
Gelert comes back. 40 minutes.
Grarri and Gelert go over. 48 minutes. Done.
You won't get shorter than this.
2006-07-31 07:01:18 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The Gelert must carry the umbrella so he takes Grundo (20) and goes back (4); he takes Gnorbu (16) and goes back (4); He then takes Grarri (8) TOTAL 52 minutes.
2006-07-31 07:00:44 · answer #2 · answered by MollyMAM 6 · 0⤊ 0⤋
20 minutes
2006-07-31 07:01:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
52 minutes
The Grundo and the Gelert crosses in first place=20
The Gelert returns with the umbrella=4
The Gnorbu and the Gelert crosses=16
the Gelert returns with the umbrella =4
The Gnorbu and the Gelert crosses= 8
Total 52 minutes.
2006-07-31 07:06:13 · answer #4 · answered by mfacio 3 · 0⤊ 0⤋
52 minutes
20 there for the Grundo w/ the gelert
4 back for the gelert
16 there for the gnorbu w/ the gelert
4 back for the gelert
8 there with the remaining garrl and gelert
4+4+8+16+20 = 52
2006-07-31 07:03:14 · answer #5 · answered by mmenaquale 2 · 0⤊ 0⤋
20 minutes.
2006-07-31 07:00:13 · answer #6 · answered by Anonymous · 0⤊ 0⤋
44 minutes
2006-07-31 07:00:23 · answer #7 · answered by Anonymous · 0⤊ 0⤋
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2016-08-28 15:05:38 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Would say
Cross1: 20m
back: 4m
Cross2: 16m
Back: 4m
Cross: 8m
total time 52m
But not sure at all if this is correct...
2006-07-31 07:01:57 · answer #9 · answered by Thomas NP 2 · 0⤊ 0⤋
Well I bet I could figure it out if I thought abt it, but im too lazy.
2006-07-31 07:00:32 · answer #10 · answered by Anonymous · 0⤊ 0⤋