I know this problem has been posted before, but I think my answer is correct and I want to know why it was considered wrong! 1. The problem statement, all variables and given/known data Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the starting line at t=0. The starting line is at x=0. Car A travels at a constant speed va. Car B starts at the starting line but has a better engine than Car A, and thus Car B travels at a constant speed vb, which is greater than va. 2. Relevant equations xb=xa when b catches up to a 3. The attempt at a solution I just set the two equal to one another: vb(t) = Da + Va (t) solving for t I arrived at t = Da \ (vb - va) and was quickly told that the answer didn't depend on va and vb...If that's true then I have no idea where to proceed and would appreciate any guidance on where to start.