Cross section at Station $18+50.$ The tie out slopes are $2\mathrm{.}5$:$1$

The TBM is $353\mathrm{.}75$ and the Backsight Rod reads $4\mathrm{.}23$

The Road Centerline at $18+50$ is $349\mathrm{.}50$

The Road Cross section has $12$ travel lanes @ $--2\%$ and an $8ft$ shoulder @ $-4\%$

The First Ground shot at the hinge point is $2\mathrm{.}6$

The Second Ground shot is taken and reads $1\mathrm{.}4$

How far away from the Hinge point should the Third Ground shot be taken?

Round answer to $1$ decimal place.

Selected Answer: $0\mathrm{.}4$

Correct Answer: $19$

Answer range $\frac{+}{-}0\mathrm{.}1(18\mathrm{.}9-19\mathrm{.}1)$