alleryدو پائپ 20 اور 30 گھنٹوں میں ایک ٹینک کو بھرتے ہیں، اور تیسرا اسے 60 گھنٹوں میں خالی کرتا ہے۔ سب کھلا، یہ بھرتا ہے۔
A15 گھنٹے
B18 گھنٹے
C10 گھنٹے
D12 گھنٹے
Answer & Solution
Correct answer: A. 15 گھنٹے
خالص شرح ہے 3/60 + 2/60 - 1/60 = 4/60 = 1/15 فی گھنٹہ، تو 15 گھنٹے۔
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