Two trains started at 10 pm, from the same point. The first train traveled North at the rate of 80 mph and the second train traveled South at the rate of 100 mph. At what time were they 450 miles apart?

• in first hour train 1 travel 80mph and train 2 travel 100mph total distance in one hour 80+100=180
  similarly in 2nd hour another 180 mph distnce travelled now total distance is 360.
  in next half hour train one travel 40mph and train 2 in 50mph. total dista nce is 90.
  in two and half hour distance travel is 360+90=450 miles
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