math algebra
posted by chica .
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 miles per hour and train B is travleing at 100 miles per hour. Train A pases a station at 3:20. If train B passes the same station at 3:35 pm, at what time will train B cathc up tp tain A?

When train B goes by the station, they are 80 x (1/4) = 20 miles apart.
The distance between the trains decreases at a rate 100  80 = 20 mph.
It will take one hour to close the gap.
That will occur at 4:35 PM
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