WE can see :
speed of paul' speed = 60 words per minute
speed of jennifer = 80 word per minute
as jennifer is typing more words than paul we can say that jennifer's spped is greater than paul's sped .
Let us now compare them
we find the difference of their speed
speed of Jennifer - speed of Paul
80 - 60 = 20 word
so we can say Jennifer is 20 word per minute faster than Paul .