Good question.

Let me try: suppose there are 200m cars in US, on average each car goes to gas stations once a week, then about 30 million cars are served everyday. Let us assume each gas station serves a car every 2 min. on average over 24 hours, then it can serve 24*60/2=720 cars every day. So roughly there are 30*1000,1000/720=40,000 gas stations.

所有跟帖： 

• And here is what I googled to get -innercool- ♀ (291 bytes) () 08/15/2009 postreply 01:10:33

• wow, amazing -botong- ♂ (0 bytes) () 08/15/2009 postreply 06:25:52

• isn't it also a quant interview question? -commentate- ♂ (0 bytes) () 08/15/2009 postreply 07:28:48

• could be -botong- ♂ (0 bytes) () 08/15/2009 postreply 09:34:58