Lisa is flying from Bush Intercontinental Airport in Houston to Newark International Airport in New Jersey with the wind. The trip is approximately 1415 miles. Lisa then flew from Newark to DFW Airport against the wind, which is approximately 1372 miles. The wind speed was the same for both parts of the trip. Without the effects of the wind, her airplane travels at an average rate of 530 mph. The total time Lisa spends in the air is 8.5 hours. What was the speed of the wind?