Hi,
The answer would be 300 messages. To explain, there are 60 seconds in a minute so 120 divided by 60 is 2, so that means 2 words per second. So to get the answer for 150 seconds, you multiply 150 by 2 and get 300.
I hope this helps!
Given rational expression is:

Now we can simplify this by factoring as shown below:





Hence final answer is 