To come at the issue from a different perspective imagine that your torpedoes can only run straight out the tube and develop a method to fire them accurately under those constraints.
You will arrive where I am if you do that.
If two cars are approaching an intersection, one at 10 mph (Car A) and the other (Car B) at 46 mph there is only ONE triangle of starting points that makes a crash happen at the intersection.
The triangle may have sides that are longer or shorter but the ratio between the two will always be 4.6 to 1.
If Car A is 10 miles from the intersection and Car B is 46 miles and they start towards the intersection at the same time, they will arrive there at the same time. The angle between Car B's line of sight to the intersection and his line of sight to Car B is precisely 12.26477 degrees at start.
That angle does not change as long as neither speed changes.
Car A at 20 miles and B at 92 miles is still a 12.26477 degree angle at the start and they collide 2 hours after start. Change either speed and the angle changes but range does not matter.
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