With the given in this item, the best way to solve for the distance between the planes is through the cosine law which can be mathematically expressed as,
c² = b² + a² - 2ab(cosC)
Substituting the given,
c² = (176.27 mi)² + (222.34 mi)² - 2(176.27 mi)(222.34 mi)(cos 38.59°)
c = 138.71 mi
Thus, the distance between the two planes is approximately 138.71 miles.