Compare the motion of two bowhead whales. Which bowhead whale was moving at a lower speed?
a bowhead whale that moved 45kilometers in 10hours a bowhead whale that moved 65kilometers 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 slower will go a shorter distance in that time. It is moving at a lower speed.
Look at the distance each bowhead whale moved and the time it took to move that distance.
One bowhead whale moved 45 kilometers in 10 hours.
The other bowhead whale moved 65 kilometers in 10 hours.
Notice that each bowhead whale spent the same amount of time moving. The bowhead whale that moved 45 kilometers moved a shorter distance in that time. So, that bowhead whale must have moved at a lower speed.