A subcontractor signed a contract to excavate5860meters of trench in hard clay for an underground cable. The

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A subcontractor signed a contract to excavate 5860 meters of trench in hard clay for an underground cable. The trench will be 30 cm wide and the average depth will be 165 cm. Rubber tire trenching

machine with one laborer in addition to the operator will be used with a productivity rate of 1.5meter min Assume 45 min for effective hour for expected delay and other conditions. The duration required to excavate the whole quantity is near to?

a)11 days

b)12 days

c)15days

d)16 days