Compare the motion of three ducks. Which duck was moving at the highest speed?

 - a duck that moved 370miles south in 10hours
 - a duck that moved 650miles east in 10hours
 - a duck that moved 600miles east in 10hours
Look at the distance each duck moved and the time it took to move that distance. The direction each duck moved does not affect its speed.
Notice that each duck moved for 10 hours. The duck that moved 650 miles moved the farthest distance in that time. So, that duck must have moved at the highest speed.