A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
A tank can be filled by a pipe in 7 hours. While a drain pipe can empty the tank in 11 hours. If the first 4 hours, the drain was left open while the pipe is filling it. How long will the tank be filled with water?
anonymous
 4 years ago
A tank can be filled by a pipe in 7 hours. While a drain pipe can empty the tank in 11 hours. If the first 4 hours, the drain was left open while the pipe is filling it. How long will the tank be filled with water?

This Question is Closed

hba
 4 years ago
Best ResponseYou've already chosen the best response.1Let x = time (hours) for second pipe to fill alone then 3(1/4 + 1/x) = 1 multiplying both sides by 4x: 3(x + 4) = 4x 3x + 12 = 4x 12 hours = x

hba
 4 years ago
Best ResponseYou've already chosen the best response.1Another solution: 1st pipe rate = 1/4 job/hr  Together rate = 1/3 job/hr  2nd pipe rate = 1/x job/hr  Equation: rate + rate = together rate 1/4 + 1/x = 1/3 Multiply thru by 12x to get: 3x + 12 = 4x x = 12 hrs (time required for the 2nd pipe to do the job alone) @stupidinmath
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.