1. The problem statement, all variables and given/known data A train is moving eastward at 60.0mi/hr. A waiter is walking westward at 2.0mi/hr. A fly is crawling north across the waiter at 3.0mi/hr. What is the velocity of the fly relative to the tracks? 3. The attempt at a solution I don't understand what it means by the fly is crawling ACROSS the waiter. And how I can find out the velocity relative to the tracks.