I eat 2 slices of pizza every 6 minutes. My sister eats 1 slice every 12 minutes. If we start eating at the same time, how long will it take us to finish a 10 -slice pizza?
A.
21 minutes
B.
24 minutes
C.
36 minutes
D.
42 minutes
Exam No：2020 First Round Grade 4 Year：2020 Question No：15
Answer:
B
Knowledge points:
G4 - Arithmetic - Rate (Basic)
Solution:
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