回复：转帖一道看似简单的“超超难”智力题

A(0)---------x-----------------y---------B(1000)

The driver first takes 2 persons to y and go back to meet other 2 person at x, and then all person arive B at same time.

we have 2 equastions:

y/10 +1000-y = y/10+(y-x)/10+(1000-x)/10
x+(1000-x)/10 = y/10+(y-x)/10+(1000-x)/10

所有跟帖： 

• x=154, y=846 -adamsmth- ♂ (23 bytes) () 09/23/2008 postreply 10:45:19

• 别忘了车往回开时也要时间的，（x+y cant be 1000) -xyz100- ♂ (0 bytes) () 10/22/2008 postreply 14:00:56