Question

Two pipes can fill the tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute

Answer 1

Answer:

Step-by-step explanation:

240 gallon

Description for Correct answer:

Part filled by 1st pipe = 120

Part filled by 2nd pipe in 1 min = 124  

Part filled by all the pipes in 1 min = 115

Work done by the waste pipe in 1 min  

= 115−(120+124)=115−(6+5120)

= 115−1120

= 8−11120=(−3120)=(−140) [-ve sign indicates emptying]  

Now, volume of 140 part = 6 gallon  

Therefore, Volume of whole tank = 40×6 = 240 gallon

Answer 2

Hey bro! This is the full question

Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is

And here is the solution

Let as take a, b, c;

a fills 20 min

b fills 24 min

a,b,c fills in 15 mins.

like

a-----------------20

b-----------------24

a+b+c-----------15

take L C M to 20,24,15 =120

that is the total capacity of the tank; Ans=120.