Consider the following. Sensor A is 2 km north of sensor B. Sensor A detects the sound of an explosion 1.375 s after sensor B. The location of the explosion lies on a hyperbola with foci at sensor A and sensor B. Let the point (0, 0) represent the center of the hyperbola on a coordinate plane in units of kilometers. Write the equation of the hyperbola. Round numerical values in the equation to the nearest hundredth.