It takes Mike 2 hours to finish a task. It takes 4 hours for Tom to finish the same task. Mike and Tom worked together on this task for one hour before Mike had to leave. How long will it take Tom to finish the rest of the task?
A.
1
B.
2
C.
3
D.
4
Exam No：2018 First Round Grade 4 Year：2018 Question No：29
Answer:
A
Knowledge points:
G4 - Arithmetic - Fractions (Application)
Solution:
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