Just a reminder, , , , ,
For this one has to assume that the World is a perfect sphere of 24,000 miles circumference.
A man (or it could be a woman) lays a piece of string measuring 24,000 miles all the way round the equator.
He then decides that he would like the string to be half an inch above ground level for all of the 24,000 miles.
How much extra string would he need?
An estimate will be sufficient - the nearest to within a limit set by me will get 5 Brownie Points.