i need this hyperbola figured out
|dw:1318882568248:dw|
2. A forest ranger at an outpost and another ranger at the primary station both heard an explosion. The outpost and the primary station are 6 kilometers apart. If one ranger heard the explosion 6 seconds before the other, write an equation that describes all the possible locations of the explosion. Place the two ranger stations on the x-axis with the midpoint between them at the origin. The transversal axis is horizontal.
(Hint; the speed of sound is about .35 km per second.)

Question

i need this hyperbola figured out 
|dw:1318882568248:dw|
2. A forest ranger at an outpost and another ranger at the primary station both heard an explosion. The outpost and the primary station are 6 kilometers apart. If one ranger heard the explosion 6 seconds before the other, write an equation that describes all the possible locations of the explosion. Place the two ranger stations on the x-axis with the midpoint between them at the origin. The transversal axis is horizontal. 
(Hint; the speed of sound is about .35 km per second.)