3.An equal-tangent sag vertical curve is designed with the PVC at station 109 + 00 and elevation 950 ft, the PVI at station 110 + 77 and elevation 947.34 ft, and the low point at station 110 + 50. Determine the design speed of the curve.

A. 50 mi/h

B. 96 mi/h

C. 99.8 mi/h

D. 53 mi/h