SOLUTION: If two oil pipelines can fill a small tank in 30 minutes. Using one of the pipelines would require 45 minutes to fill the tank. How long would it take the second pipeline alone t

Algebra ->  Rate-of-work-word-problems -> SOLUTION: If two oil pipelines can fill a small tank in 30 minutes. Using one of the pipelines would require 45 minutes to fill the tank. How long would it take the second pipeline alone t      Log On


   

Question 911889: If two oil pipelines can fill a small tank in 30 minutes. Using one of the pipelines would require 45 minutes to fill the tank. How long would it take the second pipeline alone to fill the tank?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
If two oil pipelines can fill a small tank in 30 minutes. Using one of the pipelines would require 45 minutes to fill the tank. How long would it take the second pipeline alone to fill the tank?
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1/45=work rate of one of 2 pipes
1/x=work rate of 2nd pipe
1/30=work rate of 2 pipes working together to fill the tank
sum of indv. work rates=work rate working together
..
1%2F45%2B1%2Fx=1%2F30
1%2Fx=1%2F30-1%2F45
lcd:90
90/x=3-2
90/x=1
x=90
How long would it take the second pipeline alone to fill the tank? 90 min