Mary and Nancy can each perform a certain task in m and n hours, respectively. Is m<n?

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Mary and Nancy can each perform a certain task in m and n hours, respectively. Is m<n?

1) Twice the time it would take both Mary and Nancy to perform the task together, each working at their respective constant rates, is greater than m

2) Twice the time it would take both Mary and Nancy to perform the task together, each working at their respective constant rates, is less than n

The OA is D
Source: — Data Sufficiency |