Question: An airplane makes a round trip between two points 1800 km apart, flying with airspeed 800 km/h. Whats the round trip flying time (a) if

An airplane makes a round trip between two points 1800 km apart, flying with airspeed 800 km/h. What’s the round trip flying time
(a) if there’s no wind,
(b) with wind at 130 km/h perpendicular to a line joining the two points,
(c) with wind at 130km/h along a line joining the two points?

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