Acar leaves a town by traveling at 40 mph and two hours later, a second car left the same time in the same road, and the same directions at 60 mph, the question is in how many hours the second car passes the first

"t", is the time the first car has travelled when reaching "d" distance,
whatever that is, at that point, the second car is passing it

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.