Compare the motion of three speedboats. Which speedboat was moving at the highest speed?
a speedboat that moved 395kilometers west in 5hours a speedboat that moved 345kilometers west in 5hours a speedboat that moved 335kilometers south 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 objects moving for the same amount of time. The object that is moving the fastest will go the farthest distance in that time. It is moving at the highest speed.
Look at the distance each speedboat moved and the time it took to move that distance. The direction each speedboat moved does not affect its speed.
Notice that each speedboat moved for 5 hours. The speedboat that moved 395 kilometers moved the farthest distance in that time. So, that speedboat must have moved at the highest speed.