SOLUTION: Two taps can fill a tank in 30 minutes and 40 minutes.another tap can empty it in 24 min. If the tank is empty and all the three taps are kept open,in how much time the tank will b

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Two taps can fill a tank in 30 minutes and 40 minutes.another tap can empty it in 24 min. If the tank is empty and all the three taps are kept open,in how much time the tank will b      Log On


   

Question 935034: Two taps can fill a tank in 30 minutes and 40 minutes.another tap can empty it in 24 min. If the tank is empty and all the three taps are kept open,in how much time the tank will be filled?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
r = w/t
t = w/r
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rates are additive:
r = 1/30 + 1/40 - 1/24
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t = 1/r
t = 1/(1/30 + 1/40 - 1/24)
t = 60 minutes
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