Question
An airline, all of whose planes fly with an airspeed of 300 km/h, serves three cities, A, B, and C, where B is 500 km due east of A, and C is 500 km due north of A. On a certain day there is a steady wind of 200 km/h from the east. (a) Find the time needed for a round trip from A to B and back. (b) Find the time needed for a round trip from A to C and back.

A. An airline, all of whose planes fly with an airspeed of 300 km/h, serves three cities, A, B, and C, where B is 500 km due east of A, and C is 500 km due north of A. On a certain day there is a steady wind of 200 km/h from the east. (a) Find the time needed for a round trip from A to B and back. (b) Find the time needed for a round trip from A to C and back.
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