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A large tanker can be filled by two by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill together for the other half?

A. 15

B. 30

C. 27.5

D. কোনোটিই নয়

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সঠিক উত্তরঃ B. 30

Explanation:

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A large tanker can be filled by two by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill together for the other half?