3. Two trains start from the same point at the same time, one going east at a rate of 40 km/h and the other going south at 60 km/h, as shown in the diagram at right. Find the rate at which they are separating after 1 h of travel. Train A 40 km/h ew e, Velocity, ation Train B 60 km/h Distance tions of Between Trains ization nization 4. A professional basketball team plays in a stadium that holds 23,000 spectators. With ticket prices at ess $60, the average attendance had been 18,000. When ticket prices were lowered to $55, the average attendance rose to 20,000. Based on this pattern, how should ticket prices be set to maximize ticket revenue? ce Test