A) 4 days
B) 5 days
C) 6 days
D) 6/2 days
Correct Answer: A
Solution :
One day work of A, B and C are \[\frac{1}{10},\,\frac{1}{12}\] and \[\frac{1}{15}\] respectively One day work if they work together \[=\left( \frac{1}{10}+\frac{1}{12}+\frac{1}{15} \right)\,=\frac{15}{60}\,=\frac{1}{4}\] \[\therefore \] Time required to complete the job \[=\frac{1}{1/4}\,=4\] days
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