Compare the motion of two ducks. Which duck was moving at a lower speed?
a duck that moved 315miles in 5hours a duck that moved 285miles 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 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 duck moved and the time it took to move that distance.
One duck moved 285 miles in 5 hours.
The other duck moved 315 miles in 5 hours.
Notice that each duck spent the same amount of time moving. The duck that moved 285 miles moved a shorter distance in that time. So, that duck must have moved at a lower speed.