The runner ran 300 m in 30 seconds. Find the average speed of a distance runner.

The runner ran 300 meters in 30 seconds, that is, his speed is 300/30 = 10 meters per second. But we need to write down the answer in km / h. Let’s express meters in km, seconds in hours and solve the problem.
300 m = 300/1000 = 0.3 km;
30 sec = 30/3600 = 1/120 h;
0.3 divided by a fraction 1/120, which is equal to 0.3 * 120 = 36 km / h;
Answer: The average runner speed is 36 km / h.