This might help explain how to do a very similar problem.... http://www.mathopenref.com/constbisectline.html
Answer:
6 hours
Step-by-step explanation:
because if they work together it will be 9 hours slower than Kelsey's time alone.
not sure if correct
Answer:

Step-by-step explanation:
If you foil this equation you will get:

And by dividing it, you will get;

That is your answer!
Answer:
Evidently, without the calculating 5 1/5 times 2/5 would be larger than 5 1/5 since you are already gonna multiply 2/5 and that would make it larger.
Hope this helps!
Branliest would be appreciated :DD
Step-by-step explanation: