Question 153828
The {{{2.5}}} mile track has 3,200,000 bricks.
Suppose the track was {{{5}}} miles long.
Then it would have 6,400,000 bricks.
One tenth of this distance would be {{{1/2}}} mile
and would have 640,000 bricks.
Twice this distance would be {{{1}}} mile and would
have 1,280,000 bricks