Which graph represents x> 5?

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.

Pleas ! its urgent! what is the value of x? enter your answer in the box. mm

How do you solve this step by step?