Correct Answer: Option C
Part filled in 2 hours = 2/6 = 1/3
Remaining part = (1 – 1/3) = 2/3.
(A + B)'s 7 hour's work = 2/3
(A + B)'s 1 hour's work = 2/21
So, C's 1 hour's work = { (A + B + C)'s 1 hour's work } - { (A + B)'s 1 hour's work }
=(1/6 – 2/21) = 1/14
Therefore, C alone can fill the tank in 14 hours.
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