A train leaves a station and travels north at a speed of 45 mph. Two hours later, a second train leaves on a parallel track and travels north at 75 mph. How far from the station will they meet?
First train get s a head start
rate x time = distance
45 x 2 = 90 mile head start
Second train is travelling 30 m/hr faster and will close this 90 mile difference in 90 m/30m/hr = 3 hours
The second train will have travelled 3 hours at 75 m/r = 225 miles when they meet