回複：麵試問題請教

It took me about 5 -10 mins. The answer is never. The difficult part is how to define the rate of cow eating and grass growing. I defined the total amount of grass is 1 from the begining. The daily eating rate is 1/n, and the daily growing rate is 1/x. so you get:
3/n * 3 = 1 + 3/x; 2/n *6 = 1 + 6/x; => n=6 and x=6

所有跟帖： 

• It's not that simple. -rubikscube- ♀ (287 bytes) () 05/03/2009 postreply 13:28:07

• my assumption is that a fixed size of lawn always grows the same -streetwalker- ♂ (269 bytes) () 05/03/2009 postreply 14:58:25

• My assumption is that that grass can't grow anymore -Rubikscube- ♀ (94 bytes) () 05/03/2009 postreply 15:24:54