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

 - a bicycle that moved 245kilometers east in 5hours
 - a bicycle that moved 70kilometers north in 5hours
 - a bicycle that moved 230kilometers north in 5hours
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 5 hours. The bicycle that moved 70 kilometers moved the shortest distance in that time. So, that bicycle must have moved at the lowest speed.