A car travels 250 metres in 9 seconds. What is its speed in km/h?
To find the speed in km/h, we first need to convert the distance from meters to kilometers and the time from seconds to hours.
250 meters is equal to 0.25 kilometers (since 1 km = 1000 meters)
9 seconds is equal to 0.0025 hours (since 1 hour = 3600 seconds)
Now, we can calculate the speed in km/h using the formula:
Speed (km/h) = Distance (km) / Time (hours)
Speed = 0.25 km / 0.0025 hours
Speed = 100 km/h
So, the car's speed is 100 km/h.