Bringing it all together

Question - A family has two children and these two children move away 10kms from the family and start there own family and there children are again 2 and do the same and the cycle is continued. In how much time will they have covered this planet? In how much time will there population be same as the human population of today?

How much kilometers should the children move away, so that the years it take to cover and the years it takes to reach the current population match?

Answer - Anyone!!??

One day I had a thought..

One day I thought how many people are there on this planet. Did some google search and came to the finding that the number is 6.64 billion people. Looks like an enormour number. Enormous indeed. But wait a sec...

Lets assume that all the population of the world is put together in a square formation with each person occupying 0.5M*0.5M of area. That is 0.25M-square per person.

So the population of the world would occupy 0.25*6640000000=1660000000M-square of Area

In other words this area is the area of a square of side 41KM.

Not that big!!!!!!!