1.Science and medicine. A passenger train can travel 325 mi in the same time a freight train takes to travel 200mi. If the speed of the passenger train is 25 mi/h faster the the speed of the freight train, find the speed of each.
2. Ariana took 2 h longer to drive 360 mi on the first day of a trip that she took to drive 270 mi on the second day. If her speed was the same on both days, what was the driving time each day?
3. A plane flies 720mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane's speed in still air?
4. Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500?
2. Ariana took 2 h longer to drive 360 mi on the first day of a trip that she took to drive 270 mi on the second day. If her speed was the same on both days, what was the driving time each day?
3. A plane flies 720mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane's speed in still air?
4. Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500?