Answer:
Test A: 40 words per minute
Test B: 54 words per minute
Test C: 44 words per minute
Test B has the highest unit rate
Explanation:
Test A divide 30 by
(30/0.75=40)
Test B divide 78 by
(78/1.5=52)
Test C divide 99 by
(99/2.25=44)
Hope this helps :-)