math

if a person can fill a tank in 12 min. and another person can fill a tank in 20 min. How long will it take both of them to fill 1 tank together?

asked by shirley
  1. 12/60 = 1/5 of an hour

    1 tank can be filled in 1/5 of an hour
    your rate is 5 tanks per hour

    20/60 = 1/3 of an hour

    The tank can be filled in 1/3 of an hour. your rate is 3 tanks per hour

    (5 tanks per hour)time + (3 tanks per hour)time = 1 tank filled
    5t + 3t = 1
    t =1/8 of an hour.

    This makes sense because it should take less time to fill the tank if both are working together.

    posted by JJ

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    Tap A fills up a water tank in 45 mins. Tap A fills up_____(ugh soo right here for the answer... do i put it in a fraction or something?)of the tank in one min. Tap B fills up the same tank in 75 mins. Tap B fills up_____of the
  2. science

    a large fiberglass tank was placed in a pit, before pipes could be attached and the tank filled with gasoline, the workers were asked to move the tank to another location. which of the following suggestions would be the best way
  3. college algebra

    A paint-mixing machine has 2 inlet pipes. One takes 1 hour less than the other to fill the tank. Together they fill the tank in 3 hours. How long would it take each of them alone to fill the tank? Thank you!!!
  4. college algebra

    water from a tank is being used for irrigation while the tank is being filled. The two pipes can fill the tank in 6h and 8h, respectively. the outlet pipe can empty the tank in 24h. How long would it take to fill the tank with all
  5. Math

    It takes 15 minutes to fill a large water tank. However, the tank has a small leak that would completely drain the tank in 4 hours. How long will it take to fill the tank if the leak is not plugged?
  6. Algebra

    2 pumps can fill a water tank in 45 minutes when working together. Alone, the second pump takes 3 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank? Show all work
  7. Math

    Two faucets can fill a tank in 1 hour and 20 minutes. The first faucet takes more than two hours longer to fill the same tank when functioning without the second tap. How long does it take to fill each one separately? Explain your
  8. Math

    Two taps named tap A and B are used to fill a tank. Tap A on its own takes 5 hours longer than tap B to fill the tank. The two taps working together fill the tank in 6 hours. How long does it take tap A to fill the tank on its
  9. math

    Filling a tank. Two pipes are connected to the same tank. Working together they can fill the tank in 4 hrs. The larger pipe working alone can fill the tank 6 hrs less than the smaller one, HOw long would the smaller one take,
  10. math

    A fish tank 1 feet x 1 1/2 feet x 1/2 feet is carefully used to fill a large tank which has a capacity of 15 cubic feet. How many times will the contents of the smaller tank be rquired to be emptied into the larger tank to

More Similar Questions