The train covered a distance of 30 km in 0.5 hours, and in the first 15 minutes – 20 km

The train covered a distance of 30 km in 0.5 hours, and in the first 15 minutes – 20 km, and in the last 15 minutes – 10 km. What is this movement?

Data: t (total travel time) = 0.5 h; S (total distance traveled) = 30 km; the first section t1 = 15 min = 0.25 h, S1 = 20 km; second section t2 = 15 min = 0.25 h, S2 = 10 km.

For the movement of the train to be uniform, the condition must be met: V = V1 = V2 (the speed of the train must be constant along the entire path).

V = S / t = 30 / 0.5 = 60 km / h; V1 = S1 / t1 = 20 / 0.25 = 80 km / h and V2 = S2 / t2 = 10 / 0.25 = 40 km / h.

Because V ≠ V1 ≠ V2, then the train movement is uneven.

Answer: uneven.