alleryپائپ 8 اور 12 گھنٹوں میں ٹینک کو بھرتے ہیں۔ دونوں 2 گھنٹوں کے لیے کھلتے ہیں، پھر پہلے بند ہوتے ہیں۔ دوسری کو مزید ضرورت ہے۔
A6 گھنٹے
B9 گھنٹے
C7 گھنٹے
D8 گھنٹے
Answer & Solution
Correct answer: C. 7 گھنٹے
دو گھنٹے بھریں 2 x 5/24 = 5/12; باقی 7/12 پر 1/12 فی گھنٹہ 7 گھنٹے لگتے ہیں۔
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