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An empty tank can be filled by two pipes individually in 30 minutes and 60 minutes respectively. There is also a pipe which can empty the full tank in

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An empty tank can be filled by two pipes individually in 30 minutes and 60 minutes respectively. There is also a pipe which can empty the full tank in 45 minutes.If all the three pipes are open,how much time does it take to fill the empty tank ?
A. 36 minutes
B. 18 minutes
C. 30 minutes
D. 24 minutes
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Correct Answer - A
Consider the filling of tank as a positive work and emptying the tank as negative work.
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