Your question is Product Sense: Weekend Train Travel. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How many students are traveling by train between Montreal and Toronto during one weekend?
Give a clear estimate and explain your assumptions. State the key variables you would use, how you would size the population, and how you would sanity-check the result.