No too far from Philly
...but this one thing I do, forgetting those things which are behind,
...and reaching forth unto those things which are before,...
Alright, who wants to math out how far away from the volcano they are based on the time between the eruption and the sonic boom?
I saw this in the comments
, but I am too lazy to check the math.
Given the timing delay of the shock wave — 13 seconds or so — so the folks on the boat were just over 4 km away (2.5 miles).
Edit: I checked the math and 2.5 miles away is close to what I got (2.65 miles).