Challenges
Brain challenge from 2/4/10 show.
Say Usain Bolt, Kelly and Perry were running a 100 meter dash race.
Suppose further that each ran at a uniform speed the whole race
If Usain beat Kelly by 10 meters and Kelly beat Perry by 10 meters, by how much did Usain beat Perry?
{ 2 comments… read them below or add one }
assume, usain did 100m in 10s. his speed must be 10m/s. In that time , kelly did 90m. her speed must have been 9m/s. Then kelly must have done 100m in 11.1s @ 9m/s
perry did 90m in 11.1s
his speed will be 8.1m/s. perry must have done 81m in 10s when usain did 100m.
Then , usain must have been 19m ahead of perry!
Perry is this correct,lol
@Dami – You got it!!!