Calculate the time required to sow 10.8 hectare field, if a seed drill consists of 9 furrow openers for dropping seeds and working efficiency of drill is 80%. Assume that furrow openers are 20 cm apart from one another and working speed is 5 km.h\(^{-1}\).
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Always check the units.
Convert hectares to m\(^2\) (1 ha = 10000 m\(^2\)).
Convert speed to m/h.
Efficiency is always considered as a decimal.