I'm doing the final exam and need help setting up problem #6:
6. A highway patrol plane is ﬂying 1 mile above a long, straight road, with constant
ground speed of 120 m.p.h. Using radar, the pilot detects a car whose distance
from the plane is 1.5 miles and decreasing at a rate of 136 m.p.h. How fast is the
car traveling along the highway? (Hint: You may give an exact answer, or use the
fact that
√
5 ≈ 2.2.)

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Here is my work on my paper so far...but just don't know how to proceed.

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