Elsa's rate of typing = 1.25 words per sec
Time is taken for typing each word = 0.8 a
What is unitary method used?
It is a method of solving by finding the value of one unit and the calculating the value of given unit by multiplying with the single value.
Step by step calculation
Numbers of words Elsa can type in 1 minute(the 60s) = 75
Numbers of words Elsa can type in one second = 75/60
∴ Rate of typing = 1.25 words per sec
Time is taken to type one word = 60/75
= 0.8 sec
Learn more about ut unitary method here: https://brainly.com/question/15300456
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