math
posted by shirley .
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?

math 
JJ
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.
Respond to this Question
Similar Questions

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? 
college algebra
A paintmixing 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? 
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 to … 
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 own? 
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, working … 
akgebra
One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank? 
Math
One pipe fills a tank in 1 hour while another pipe can fill the same tank in 2 hours. How long will it take to fill the tank if both pipes are used. 
school
A large pipe can fill a tank 10 minutes faster than it takes a smaller pipe to fill the same tank. Working together, both pipes can fill the tank in 12 minutes. How long would it take the large pipe working alone to fill the tank? 
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? 
math
A can fill in 5min and B in 20min.if both taps are opened then due to a leakage it took 30min more to fill tank.if tank is full,how long will it take for the leakage alone to empty the tank?