Please explain thoroughly - I'm completely lost

Consider two masses, connected by a massless string over a massless, frictionless pulley as shown in the diagram. X m2 m1Scenario 1: Suppose both masses are moving at a constant speed, with mass m1 moving up and mass m; moving down. What is the relationship between the masses? (8) m1 : m2 (b) m m2 Scenario 2: Now suppose that m1 = 8 kg and m2 = 5 kg, and the system is released from rest in the position shown in the gure. Which relationship for the tension in the string, T, is correct