Compare the motion of two mountain bikers. Which mountain biker was moving at a lower speed?
a mountain biker who moved 175kilometers in 5hours a mountain biker who moved 85kilometers 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 slower will go a shorter distance in that time. It is moving at a lower speed.
Look at the distance each mountain biker moved and the time it took to move that distance.
One mountain biker moved 85 kilometers in 5 hours.
The other mountain biker moved 175 kilometers in 5 hours.
Notice that each mountain biker spent the same amount of time moving. The mountain biker who moved 85 kilometers moved a shorter distance in that time. So, that mountain biker must have moved at a lower speed.