question_answer

At the foot of a mountain, the elevation of its summit is \[45{}^\circ \]. After ascending 1 km towards the mountain upon an incline of \[30{}^\circ ,\] the elevation changes to \[60{}^\circ \]. Find the height of the mountain.

A)  4.333 km                     

B)  2.266 km

C)  3.233 km                     

D)  1.366 km

E)  None of these