Answer: 215 seconds
Step-by-step explanation:
This is a ratio problem so you can set up the ratio like this:
120 words : 100 second.
If you divide both sides of the ratio by 120 you get:
1 word: 0.8333 seconds
Multiply both sides of the ratio by 258 and you get:
258 words: 215 seconds.
Therefore typing 258 will take them 215 seconds.
This will take 215 seconds to type 258 words.
This problem is solved by the concept of unitary method.
Given that Typist types 120 words in 100 seconds
so in one second he types 120/100 words = 1.2 Words per second
let us suppose he types 258 words in 'x' seconds
so in one second he types 258/x words
258/x = 1.2
x = 258/1.2
x = 215 seconds
For more information, please refer to the following link
https://brainly.com/question/19423643
