5.
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Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:
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Answer: Option C
Explanation:
Part filled in 2 hours =
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2
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=
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1
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6
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3
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Remaining part =
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1 -
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1
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=
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2
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.
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3
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3
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(A + B)'s 7 hour's work =
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2
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3
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(A + B)'s 1 hour's work =
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2
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21
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C's 1 hour's work = { (A + B + C)'s 1 hour's work } - { (A + B)'s 1 hour's work }
C alone can fill the tank in 14 hours.
