Here is the diagram and the required value of other angle.
Hello!

Use the Pythagorean Theorem to solve for the hypotenuse:
a² + b² = c²
Plug in the given values:
12² + 4² = c²
144 + 16 = c²
160 = c²
Take the square root of both sides:
c = √160
c ≈ 12.65.
Answer:
46 mph
Step-by-step explanation:
Distance = speed x time
92 mi = speed x 2 hr
speed = 92/2 = 46 mph