Darla typed her term paper for two hours with out a break. If her average word per minute speed increased by 20% in the second hour and her term paper was 7920 words long, what was her typing speed during the second hour.
(A) 50 (B) 60 © 62 (D) 62 (E) 72
I know the ans., but the explanation I'm giving is a short cut. I need the whole picture first before applying any short cuts. Please provide explanation with equations.
Thanx!
Mirella