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A2 type ‘P’ pipes can fill a tank in 640 hours, while B2 type ‘Q’ pipes can fill the same tank in 490 hours. (10A × 4

B type ‘P’ pipes can fill the same tank in how many hours? (Efficiency of a type P and a type Q pipe is same)

A 10 hrs

B 15 hrs

C 12 hrs

D 14 hrs

E None of these

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