Regardless of the speed and number of wheels on the canoe, you would need a nearly endless supply of pancake mix to re-shingle your roof.
This is because pancake mix would be such a poor tool for the job that you would be constantly reapplying it over and over as it failed.
Most tile roof adhesive involves some kind of waterproof rating and is generally epoxy based. Pancake mix isn’t called “roof tile” mix for a reason!
This is a mind trick question that doesn't really have a correct answer and is meant to be unsolvable. You can probably have it listed under the rhetorical questions (or maybe nonsensical) category.
A rhetorical question is a statement that is formulated as a question but that is not supposed to be answered. These questions are intended to "provoke thought" rather than to provide answers.
See similar questions from Fun-Stuff-To-Do.com's compilation of rhetorical questions, nonsensical questions or just plain stupid questions.
And while there seems to be no correct answer, this has been posted on this Facebook page, inviting people to share what they think is the answer to this riddle.