This one needs a diagram, so I’m gonna use my l33t ph0t0sh0p skillz:
Imagine you’re at point A, you’re trying to get to point B which is not far away, but an obstacle at X is blocking the road completely. C is the minimum detour between A and B using drivable streets.
Here is the question: For what point X on the island of Montreal is this minimum detour the longest?
Bryan gets it right below. A break along Senneville Road would be most disruptive, requiring a detour of over 16km through Ste-Marie Rd. and Anse-à-l’Orme Rd.
I guess that’s what happens when you live in a city that has only one road.