That one, there!
You use exactly the same instruments to measure speed in the metric system as you use in any other system. For example, a speedometer, or a distance measuring device and a stopwatch. The difference is that these devices are calibrated in metric units, instead of old-fashioned units.
A time graphs units is what is used for the y-axis. This is what show the speed in time.
300 million meters per second
km/hr is a standard measure of speed in metric units. The speed of a train is usually quoted in km/hr or miles/hr, depending on the whether metric or Imperial/US units are being used, which varies from country to country.
Metric units include millimeters, centimeters, decimeters, and meters.
metric units are used for everything in Canada
SI and metric are the same units.
The mass of a beetle in metric units is 5 metric units no joke!
"Metric conversion" refers to the change from English units of measurement to metric units.
The information given by the slope of ("on") a distance-time graph is the SPEED. The size ("magnitude") of the slope is the size of the speed and the units of the distance axis are divided by the units on the time axis to give the units of the speed ... so if your distance is in miles and time is in hours then your speed will be in miles per ("divided by") hours (mph)... but if distance is in metres and time is in seconds then the speed is in metre per second (m/s).
Speed is measured in metres per second (or kilometres per hour), and length is measured in metres.