How to find the missing angle of a triangle using trig when you only know 1?

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

What is the measure of angle afe? 79 81 91 99

Need this asap if anyone can i would be very grateful. if you could show workings that would really