The train moves uniformly on a 10 km straight track for 15 minutes. Determine its speed.

Given:

L = 10 kilometers – the distance traveled by the train during the time interval t;

t = 15 minutes – time span.

It is required to determine v (meter per second) – the speed of the train.

Let’s convert the units of measurement of the path from kilometers to meters:

L = 10 km = 10 * 1000 = 10000 meters.

Let’s convert time units from minutes to seconds:

t = 15 minutes = 15 * 60 = 900 seconds.

Then, since according to the condition of the problem, the movement of the train is uniform (that is, with a constant speed), then:

v = L / t = 10000/900 = 11.1 m / s (the result is rounded to one decimal place).

Answer: the train speed is 11.1 m / s.