Q: P and Q can reap a field in 9 days, Q and R can reap it in 12 days and P and R in 18 days. Find how many days will they take to reap the field if all three work together?
A.
39 days
B.
4 days
C.
8 days
D.
19.5 days
Correct Answer:
Option C -
Explanations:
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