12 A cylindrical over head tank has 2 fill pipes P and Q. P alone can fill the tank in 12 hours whereas Q alone can fill the same tank in 8 hours. As a testing strategy both
the pipes are made to operate on alternate hours starting with P (i.e.) initiall pipe P is switched on and after one hour it is switched off and Q is switched on. This
operation gets repeated for every hour. Find in how many hours will the tank be filled according to this strategy?
A) O 9 hours
B) O
29
hours
3
28
hours
3
D) 10 hours
E) O none of these
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