Question 1197414
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The solution from tutor @josgarithmetic has the typing speed increased BY 60 words per minute; the statement of the problem says the typing speed increased TO 60 words per minute.<br>
The job was done in 3 hours; at a typing speed of 60 wpm it would have been completed 2 hours faster -- i.e., in 1 hour.<br>
The time required to complete the job is 1/3 of what it was; that means the typing speed was 3 times what it was before.<br>
If 60 wpm is 3 times the original speed, then the original typing speed was 20 wpm.<br>
ANSWER: 20 words per minute<br>