3:15 is right.
There are 1,852 m in a nautical mile. A knot is 1,852 m in an hour. That’s 30.87 m per minute. We want to know how long it takes 1 knot of speed to travel 100 m to make the “map trick” work, so 100 m / 30.87 m = 3.24 minutes, so roughly 3:15.
I put my money on the torpedo tubes not being ordered prior to the shot.
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