Answer:
The answer is "120 words".
Step-by-step explanation:
[tex]\therefore \text{12 words type in 4 second}[/tex]
[tex]\because 12 = 4\\[/tex]
if we multiply the above value by 10 its value will:
[tex]\to 12 \times 10 = 4 \times 10\\\\\to 120 = 40\\[/tex]
that's why 40 seconds = 120 words
