184.85 sec.

1. 3 and 4 walking, 1,2,5 on the car
2. drops 5 then 2 then go back.
3. pick up 4 then 3
So it is 2 and 3 will real count. Put let 3 walk first.
The all the important points on the road will break the road into 3 parts: x y z
x+y+z=1000
x/3=(x+2y)/10
z/2=(2y+z)/10
then you do the math.

I am right?

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• 回复：184.85 sec. so many typos, check this one -SoFkinWasted- ♂ (383 bytes) () 10/03/2008 postreply 16:35:04