a) The passenger train can travel 325 mi. in same time freight train takes to travel 200mi. If speed of passenger train is 25 mi/h faster than speed of freight train determine speed of each.
b) Ariana took two hour longer to drive 360 mi on first day of trip than she took to drive 270 mi. on second. If the speed was same on both days, find the driving time each day?
c) The plane flies 720 mi against the steady 30-mi/h headwind and then returns to same point with wind. If whole trip takes 10 h, find plane's speed in still air?
d) Kevin earned $165.00 interest for 1 year on the investment of $1500.00. At the similar rate what amount of interest would be earned by the investment of $2500.00?