Answer
$1.430*10^{-6} m^3\div[3.14*(2.500*10^{-6})^2]=7.284*10^4 m=72.84km$
Work Step by Step
The cross section is a circle, meaning the base area=3.14r$^2$
Volume=base area*height, the length is the height in this case.
Length=volume/base area=V/(3.14r$^2$) in meters.
Convert it into km by 1 m=1000 km.
