Answer:
75 minutes
Step-by-step explanation:
The rate at which the tank is filled up, F, and emptied, E, are respectively:
Since V is the full volume of the tank, the time required to fill the tank if both pipes are open is given by:
It will take 75 minutes to fill the tank if both pipes are open.
b
Check the picture below.
make sure your calculator is in Degree mode.
does it meet the requirements? well, 3.43 < 4.8.