39 persons can repair a road in 12 days, working 5 hours a day. In how many days

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Question: 39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?

Options are:

A.     10
B.     13
C.     14
D.     15

Correct answer is:

B.     13