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What is the area covered per day of 8 hours by a tractor down four bottom 35 cm plough if the speed of the ploughing is 6km per hour, the time lost in turning is 6%?

a) 0.39 hectare
b) 0.67 hectare
c) 0.23 hectare
d) 0.40 hectare

Answer: d
Explanation: Area covered/hr = \(\frac{35}{100}*\frac{4}{1}*\frac{6*1000}{1}\) = 8400 m2
Area to be covered in 8 hours = 8400*8 m2
Turning loss = \(\frac{6.72*6}{100}\) = 0.40 hectare.

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