What is the unit rate of 140 words typed at 4 minutes?

1 Answer
Nov 15, 2016

The unit rate is #(35 " words")/ (1 " minute")# or 35 words per minute.

Explanation:

A unit rate is a rate where the second number is one unit.

In this example, we are looking for the number of words that can be typed in one minute if 140 words can be typed in 4 minutes.

You could simply divide #140# by #4 = 35# or set up a proportion:

#(140 " words")/(4 " minutes")= (x " words")/(1 " minute")#

Cross multiply.

#4 * x = 140 * 1#

#4x = 140#

#(4x)/4 = 140/4color(white)(aaa)#Divide both sides by 4

#x = 35 words#

The unit rate is #(35 " words")/ (1 " minute")# or 35 words per minute.