Compare the motion of two buses. Which bus was moving at a higher speed?
a bus that moved 450kilometers in 10hours a bus that moved 550kilometers 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 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 bus moved and the time it took to move that distance.
One bus moved 550 kilometers in 10 hours.
The other bus moved 450 kilometers in 10 hours.
Notice that each bus spent the same amount of time moving. The bus that moved 550 kilometers moved a farther distance in that time. So, that bus must have moved at a higher speed.