Compare the motion of three bicycles. Which bicycle was moving at the highest speed?

 - a bicycle that moved 130miles west in 10hours
 - a bicycle that moved 55miles north in 10hours
 - a bicycle that moved 170miles west in 10hours
Look at the distance each bicycle moved and the time it took to move that distance. The direction each bicycle moved does not affect its speed.
Notice that each bicycle moved for 10 hours. The bicycle that moved 170 miles moved the farthest distance in that time. So, that bicycle must have moved at the highest speed.