Question

Michael takes 90 min to type 5850 words. If he increase his typing speed by 5words/min, how many minutes will he take to type 10,500

Answer 1

10,500/((5850/90)+5)

Answer 2

First get unit rate of 90 min for 5850 words, so divide 5850 by 90 min. Then add 5 to result. Then divide 10,500 by new number of words per min.