Answer:
It will take 150 hours to fill all 3 tanks at a time.
Step-by-step explanation:
Water flows in pipe 1 at a rate of 25,000 gallons per hour.
Other pipe at a rate of 45,000 gallons per hour.
Water leaves the system at a rate of 60,000 gallons per hour.
There are 3 of these tanks and each tank holds 1 million gallons.
Each tank is half full.
So, total capacity of 3 tanks = 3 millions and it is half full.
The water need to be filled = 1.5 millions. At the same time 60,000 gallons of water leaving out.
25,000 x + 45,000 x - 60,000 x = 1.5 millions
70,000x -60,000x = 1500000
10,000x = 1500000
Dividing both sides by 10,000, we get
x = 150 hours
Therefore, it will take 150 hours to fill all 3 tanks at a time.
