# Finding The Length Of Parabolic Curve Given Change In Grade Per Station

**Problem**

A +0.8% grade meets a -0.4% grade at km 12 + 850 with elevation 35 m. The maximum allowable change in grade per station is 0.2%. Determine the length of the curve.

A. 300 m | C. 80 m |

B. 240 m | D. 120 m |

**Answer Key**

[ D ]

**Solution**

$\dfrac{L}{0.8 + 0.4} = \dfrac{20}{0.2}$

$L = 120 ~ \text{m}$ ← *answer*

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