3 _ 3 _ 3 _ _ _ 3 _ 3 _ _ 3 _ _ 3 _ 3 _ _ _ 3 _ 3 _ 3 _ _ _ _ 3 3 _ _ 3 _ 3 _ _ 3 _ _ 3 _ _ 3 _ 3 _ _ 3 _ _ _ 3 3 _ _ _ 3 _ 3 _ 3 _ _ _ 3 _ _ 3 3 _ _ _ _ 3 _ 3 _ 3 _ 3 _ 3 _ _ _ 3 _ 3 _ _ 3 _ _ 3 _ 3 _ _ _ 3 _ 3 _ _ 3 _ 3 _ _ 3 _ _ 3 _ _ 3 _ 3 _ _ _ 3 _ 3 _ _ 3 _ 3 _ 3 _ _ _ 3 _ 3 _ _ 3 _ _ 3 _ _ 3...

I think that your strategies are fast but only once you get to think them out. For a problem like this, opting for a solution other than a straightforward algebraic one would be unwise during a test. Also, I believe that your knowledge of the answer helped you think out the alternative strategies, s...

This is the original question: Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each...