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Two LORAN radio stations A and B are 140 kilometers apart and send a simultaneous radio signal to a ship.
The signal from B arrives 0.0002 seconds before the signal from A. If the signal travels 300,000 kilometers per second, find the equation of the hyperbola on which the ship is positioned. Use a coordinate system where the origin is the midpoint between the stations, and the stations lie on the x-axis.
`x^2/900 - y^2/4000 = 1`