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Pipe A can fill a tank in 36 minutes and...

Pipe A can fill a tank in 36 minutes and pipe B is able to empty this in 45 minutes. If both pipes are opened simultaneously, then the tank will filled half in _______hours.
पाइप A किसी टैंक को 36 मिनट में भर सकता है। और पाइप B उसे 45 मिनट में खाली कर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया है, तो टैंक की आधी क्षमता को भरने में लगने वाला समय (घंटो में) है:

A

2

B

1.5

C

1.25

D

1.75

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