Compare the motion of two mountain bikers. Which mountain biker was moving at a lower speed?
a mountain biker who moved 150miles in 10hours a mountain biker who moved 170miles in 10hours
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 mile.
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 150 miles in 10 hours.
The other mountain biker moved 170 miles in 10 hours.
Notice that each mountain biker spent the same amount of time moving. The mountain biker who moved 150 miles moved a shorter distance in that time. So, that mountain biker must have moved at a lower speed.