Compare the motion of two trains. Which train was moving at a higher speed?
a train that moved 405kilometers in 5hours a train that moved 540kilometers in 5hours
An object's speed tells you how fast the object is moving. Speed depends on both distance and time.
Distance tells you how far the object has moved. One unit used to measure distance is the kilometer.
Time tells you how long the object has spent moving. One unit used to measure time is the hour.
Think about two objects moving for the same amount of time. The object that is moving faster will go a farther distance in that time. It is moving at a higher speed.
Look at the distance each train moved and the time it took to move that distance.
One train moved 540 kilometers in 5 hours.
The other train moved 405 kilometers in 5 hours.
Notice that each train spent the same amount of time moving. The train that moved 540 kilometers moved a farther distance in that time. So, that train must have moved at a higher speed.