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Answer:
104 miles (nearest whole number)
Step-by-step explanation:
Applying Pythagorean theorem which is: c² = a² + b². Where,
c = distance between the two planes = ?
a = distance of the first plane from the airport = 80 - 1 = 79 miles
b = distance of the second plane from the airport = 68 - 1 = 67 miles
c² = 79² + 67²
c² = 10,730
c = √10,730
c = 103.585713
c = 104 miles (nearest whole number)