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Pipe 1 can empty a tank in 6 h while pipe 2 can do so in 18 h. If both are working together, in how much time will they empty the full tank?
9 h
4.5 h
10 h
5 h
Explanation:- Pipe 1 can empty a tank in 6 h
Pipe 2 can empty a tank in 18 h
1 = 6 hours 2 = 18 hours so their lcm is 18 and effeciency is 3 and 1 . so 18 /(3+1) = 18/4 i.e. = 4.5 h
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