From the equator, two planes took off simultaneously on a round-the-world trip. The first is along the equator

From the equator, two planes took off simultaneously on a round-the-world trip. The first is along the equator, the second is along the meridian. Which of the planes will return and how much earlier if they fly the same number of hours every day and fly at an average speed of 700 km / h?

1) Equator length = 40,075, 78 km
40,075, 78 km: 700 km / h = 57, 25 hours – the flight time of the aircraft along the equator.
2) The length of the meridian = 40,008.5 km
40,008.5 km: 700 km / h = 57, 155 hours – the flight time of the aircraft along the meridian.
3) 57.25 – 57.155 = 0.095 hours – time difference
60 × 0.095 = 5.7 minutes
Answer: the plane that flew along the meridian will return 5.7 minutes earlier.

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