From one city to another, the distance between which is less than 300 kilometers, the train left after 3 hours

From one city to another, the distance between which is less than 300 kilometers, the train left after 3 hours, it still had to travel 45 kilometers. Estimate the speed of the train.

Let R km be the distance between cities, R <300.
V km / h – train speed. We write the condition of the problem in the form of an equation:
R – 3 * V = 45
3 * V = R – 45
V = R / 3 – 15
Since R <300, then
V <300/3 – 15 = 100 – 15 = 85 km / h
Answer: the train speed is less than 85 km / h.