You multiply speed by time. The units of time cancel out to give metres (distance) on its own
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18.4
900 meters/30 seconds = 30 meters/second
To calculate speed, you need to divide the distance traveled by the time taken. In this case, the runner covers 200 meters in 50 seconds. Therefore, the speed of the runner would be 200 meters divided by 50 seconds, which equals 4 meters per second.
Just multiply the two numbers. If you multiply 12 meters x 13 meters, the result will be in square meters (as when you get the surface of a rectangle). But if you multiply (12) x (13 meters), the result will be in meters (as in: how many meters do you walk when you walk a distance of 13 meters, 12 times?)
Multiply by a million