If 80 persons can finish a work within 16 days by working 6 hours a day. the number of hours a day, should 64 persons work to finish that very job within 15 days is:

If 80 persons can finish a work within 16 days by working 6 hours a day. the number of hours a day, should 64 persons work to finish that very job within 15 days is:
1). 5 hrs.
2). 7 hrs.
3). 8 hrs.
4). 6 hrs.

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