It takes 30 minutes to completely fill a tank. If, however, a hole allows $$\(\frac{1}{3}\)$$ of the water that is entering the tank to escape, how long will it then take to fill the tank?
A.
40
B.
45
C.
60
D.
90
Exam No：2018 First Round Grade 5 Year：2018 Question No：40
Answer:
B
Knowledge points:
G5 - Arithmetic - Rate & Ratio Problems
Solution:
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