．Brooke＇s empty tub fills in 20 minutes with the drain plugged，and her full tub drains in 10 minutes with the water off．How many minutes would it take the full tub to drain while the water is on？
A.
（A） 12
B.
（B） 15
C.
（C） 20
D.
（D） 30
Exam No：2018 First Round Grade 4 Year：2018 Question No：40
Answer:
C
Knowledge points:
G4 - Arithmetic - Fractions (Application)
Solution:
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