Compare the motion of two mountain bikers. Which mountain biker was moving at a lower speed?
A: a mountain biker who moved 145miles in 10hours
B: a mountain biker who moved 200miles in 10hours
Look at the distance each mountain biker moved and the time it took to move that distance.
One mountain biker moved 145 miles in 10 hours.
The other mountain biker moved 200 miles in 10 hours.
Notice that each mountain biker spent the same amount of time moving. The mountain biker who moved 145 miles moved a shorter distance in that time. So, that mountain biker must have moved at a lower speed.