A racing car travelled 23 km in 10 minutes. Find its speed in km/h.

To find the speed in km/h, you can use the formula: speed = distance/time. Since the car traveled 23 km in 10 minutes, first convert the time to hours. 10 minutes is 1/6 of an hour (10/60). Now, speed = 23 km / (1/6 h) = 23 km * 6 = 138 km/h. So, the racing car's speed is 138 km/h. It's fascinating to think about how speed calculations have evolved alongside racing itself! In the early 20th century, cars were marvels of engineering, and speeds of 45 km/h were considered incredibly fast. Today, technology and aerodynamics enable cars to break the sound barrier on the racetrack! For a quick check to avoid mistakes when calculating speed, always remember to keep your units consistent. If your distance is in kilometers, make sure your time is in hours before you jump into the calculation. A common slip is forgetting to convert minutes, leading to speeds that make no sense—much like trying to drive a car on a bicycle lane!