In this problem, you're provided with two quantities, Quantity I and Quantity II, and your task is to solve both quantities and determine the correct relationship between them. Quantity I: The speeds of two cars, 'A' and 'B,' are in the ratio 3:4. If car 'B' takes 5 hours to travel 240 kilometers, calculate the speed of car 'A.' Quantity II: A train requires 15 seconds to pass a pole. Given that the length of the train is 180 meters, determine the speed of the train. Now, compare Quantity I and Quantity II to establish the correct relationship between them and choose the appropriate option.