A) 10 days
B) 11 days
C) 12 days
D) 14 days
Correct Answer: C
Solution :
Time taken by Chotu and Nitu to plough the field together = 4 days Time taken by Nitu to plough the field = 6 days. \[\therefore \] Chotu and Nitu's 1 days' work \[=\frac{1}{4}\] Nitu's 1 days' work \[=\frac{1}{6}\] Now, Chotu's 1 days' work = (Chotu and Nitu's 1 days' work) - (Nitu's 1 days' work) \[=\frac{1}{4}-\frac{1}{6}\,=\frac{3-2}{12}=\frac{1}{12}\] Hence, Chotu can plough the field in 12 days.
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